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- Subject: rec.pets.cats: Feline Leukemia FAQ
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- Last-modified: 13 Aug 1999
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- =======
- The latest versions of these FAQ's may be obtained via the Web at
- http://www.fanciers.com/cat-faqs/
-
- The multiple posted (ASCII) parts of the FAQ are all archived at rtfm.mit.edu
- (18.181.0.24) in the directory /pub/usenet/news.answers/cats-faq. These
- files will also appear in other sites that mirror the RTFM archives.
- ==========
-
-
- Feline Leukemia Virus FAQ
-
- (dedicated to Oliver and countless other cats whose lives have been
- mercilessly shortened by this virus. We will all meet them again at
- the Rainbow Bridge.)
-
- Contents:
- * General information about FeLV
- * If your cat has tested positive
- * References
- * Other FeLV sites
-
- Last updated April 20, 1998.
-
- Authors:
- Written by Erin Miller [ ermiller@dgsys.com] with help from James
- Golczewski, PhD; Edwin Barkdoll, DVM-to-be; Cindy Tittle Moore;
- Jeff Parke, DVM; C.M. Newell, DVM; Barb French; Richard Kinoshita;
- and Ann Huber. Additional thanks to Wilf Leblanc, Dan Kozisek,
- Karen Kolling, Isako Honshino, Patty Winter, Harold Lemon, Jill
- Kronstadt, and many members of the Cat Fanciers' Internet Mailing
- List for their comments.
-
- The purpose of this FAQ is to answer frequently asked questions about
- the Feline Leukemia Virus (FeLV). The Feline Leukemia Virus is a virus
- which suppresses your cat's immune system. A cat that becomes infected
- with the virus becomes susceptible to many ailments or breakdowns in
- its system. The virus was somewhat inappropriately named because it is
- different than the disease Feline Leukemia. A cat that tests positive
- for the virus will not necessarily contract the disease Feline
- Leukemia. However, cats that do test positive for the virus are more
- likely to catch any one of a number of diseases including, but not
- limited to, leukemia, lymphoma or opportunistic infections. This FAQ
- is divided into two parts; the first consists of information every cat
- owner should know or should ask about the virus. The second part is
- information for people whose cats have tested positive for the virus.
- _________________________________________________________________
-
- PART I: General Information about FeLV
-
- What is Feline Leukemia Virus and can I catch it?
- Feline Leukemia Virus is a virus that is specific to cats only. It is
- considered to be the most common cause of serious illness and
- death in domestic cats. It causes a breakdown in your cat's immune
- system causing your cat to become susceptible to many diseases
- which it might otherwise be able to fight off. It CANNOT be
- transmitted to humans (including children) nor can it be
- transmitted to other species such as dogs. The National Cancer
- Institute and the National Institutes of Health have written a
- CancerNet Factsheet which is available via gopher. See the
- References section for more information on this.
-
- I've heard FELV is like AIDS. Can I catch AIDS or anything else from
- it?
- People often use the "it's like AIDS" phrase to describe a number of
- illnesses in the animal (and human) community with the idea that
- most people know so much about AIDS that this analogy is useful.
- Unfortunately most people don't know much about AIDS and the
- resulting effect is to scare people out of their wits and have
- them dump their cats or dogs at the nearest pound because they are
- so deathly afraid of AIDS. They are similar to AIDS in that they
- affect and weaken the body's immune system. The ONLY similarity
- between FeLV, FIV (Feline Immunodeficiency Virus) and FIP (Feline
- Infectious Peritonitis) is in their genetic makeup. All are RNA
- (as opposed to DNA) viruses, and FeLV and FIV are what are known
- as "retroviruses." FIP is a "coronavirus." (See the FIP FAQ for
- more information on this disease).
-
- What is a retrovirus?
- Retroviruses carry with them an enzyme that causes a process to occur
- in the DNA known as "reverse transcription." RNA normally pairs up
- with DNA, copies itself, and thus increases/replicates itself.
- When an RNA retrovirus does this, it fools the DNA to copy *it*,
- instead of the normal RNA, thus causing even more of the
- retrovirus to be created. So as long as a particular cell is
- affected with the retrovirus, that cell will be affected for its
- whole life. One would have to kill the cell before it reproduces
- to eliminate any chance of that cell making any more FeLV or FIV
- RNA. This is one of the reasons why it is so difficult to get rid
- of, because you must kill all the cells which contain the virus,
- and attempting to do this may either kill the animal itself, or it
- is simply impossible to tell which cells have the virus in the
- first place. Basically, a retrovirus is a parasite at the genetic
- level, a DNA-tapeworm, if you will.
-
- How is it transmitted?
- FeLV is transmitted via saliva, mucus, urine, feces and blood. This
- means mutual grooming and biting/fighting are the most likely
- methods of transmission, although sneezing, hissing, sharing
- food/water bowls and sharing litter boxes are also possible means
- of transmission.
-
- Will I infect my healthy cat if I pet an FeLV+ cat, then pet my cat?
- No. Not unless you were to go immediately from one cat to another, and
- have wet saliva, urine or blood on your hand. Even then the
- chances would be slim. FeLV needs to be transferred through the
- media above, and will not live long outside the host (the infected
- cat). Warm, dry environments will deactivate the virus and common
- household detergents and disinfectants will eliminate it from any
- contacted surfaces. If you wash your hands with soap after
- touching an infected cat, you will not infect an FeLV negative
- cat.
-
- What does the virus do to a cat?
- In sum, once the virus gains entry (usually via saliva or mucus
- membranes) it will reproduce in the lymph tissue which is your
- cat's first system of immune defense. Some cats are able to mount
- a successful immune response against it and defeat the virus at
- this stage. In cats who don't successfully destroy the virus here,
- the virus will then move into the bone marrow where red and white
- blood cells are produced. It may stay latent in the marrow for
- many years. After that it will attack other tissues, including
- possibly causing a breakdown in several stages of the immune
- response system.
-
- Is there a vaccine?
- Yes, there are several commercial vaccines available. Unfortunately
- the USDA does not have standard requirements for FeLV vaccines, so
- different manufacturers can publish 'Effectiveness Ratings' which
- cannot be compared with each other due to a lack of uniformity in
- testing terms and requirements. Estimating the effectiveness of
- the vaccines is difficult and most vets I've spoken with estimate
- them to have ~75-85% effectiveness (this means cats challenged
- with the virus will fight off infection 7-8 times out of ten).
- Published studies show that there are irreconcilable differences
- and bias in Effectiveness Ratings put out by the manufacturers so
- currently it is impossible to estimate the actual effectiveness of
- and between vaccines. Suffice it to say that your cat is MUCH
- better off trying to fight the virus having received the vaccine,
- but the vaccine is not 100% effective so you should not expose
- your cat to undue risks. (Note: NO vaccine, whether it be for
- cats, dogs or people, is 100% effective. Some are about close to
- being as fully effective as possible, however the FeLV vaccine is
- not one of them).
- Since writing the first version of this FAQ, I've had a number of
- people tell me that a cat has only a 30% likelihood of catching
- the disease, and even then if only in persistent close contact. I
- have found nothing in the recent literature to support this claim,
- and every veterinarian I have spoken with states that the
- likelihood of becoming infected depends on the level of exposure,
- which vary in different locales and situations. Since most tests
- are done in controlled situations, it would be impossible to come
- up with true "real world" statistics. In one vet's words "But what
- if it is only 30%? Would you stop wearing seat belts if there was
- only a 30% chance of serious accidents if you commuted in a car
- every day? I hope the odds are far less than that ... and yet I
- still hope you are taking the appropriate safety cautions. Unless
- the vaccine has been proven to cause serious harm, it is a good
- precaution to take, regardless of the percent chance of disease
- transmission."
-
- If I don't get my cat vaccinated, what are its natural defenses
- against the virus?
- According to the literature, neonatal kittens are 100% susceptible to
- catching the virus from one exposure. 8-week-old weanlings are 85%
- susceptible from one exposure. There is serious debate over the
- likelihood of non-vaccinated, healthy adult cats becoming infected
- with the virus but it seems that ~40% of cats exposed become
- immune, ~30 percent become persistently infected (show acute signs
- of a related-disease) and ~30 percent become infected, but the
- virus is latent in their system. (Hardy, et al, 1980).
-
- Is the vaccine expensive and how often do my cats need to be
- vaccinated?
- After your cat has gone through its more elaborate set of
- kitten-shots, the FeLV vaccine should be given once a year. If you
- adopt an adult cat and don't know if it has been vaccinated for
- FeLV, start it immediately on its annual shots. If you are unsure
- if your adult cat needs be vaccinated, talk to your vet. Prices
- vary between vets, locally and nationally. I surveyed readers of
- rec.pets.cats and contacted vets around the country and found that
- prices for the vaccination alone cost between $9 and $30 dollars.
- The average was $18 (not including the vet-visit charge). It seems
- that the FeLV test costs about the same, but I didn't do a
- full-scale survey.
-
- If I get my cat vaccinated, isn't there a chance that it will catch
- the virus from the vaccine?
- No. As of July 1992, all of the vaccines which are approved for sale
- in the United States are incapable of causing a positive FeLV test
- result. (Sorry, but I don't have figures for vaccines in other
- countries. If anyone does, feel free to append them onto this
- FAQ.)
-
- Is there any risk in getting my cats vaccinated?
- There is always a risk that your cat may have a bad reaction to a
- vaccine, ANY vaccine. It is a good idea to wait in your vet's
- waiting room for 30 minutes after receiving a vaccination, ANY
- vaccination, to make sure your cat does not have an adverse
- reaction, and if it does the vets will be on hand to deal with the
- situation.
- There is also some evidence that vaccinations in general may be
- the cause of tumors (known as postvaccinal sarcomas or
- fibrosarcomas). The chance of this happening is estimated to be
- approximately 1-2 in 10,000, but you should be aware of it
- nonetheless. This has not been limited to FeLV vaccines, in fact
- it was originally thought to pertain solely to rabies vaccines,
- but this is not thought to be the case any more. Since this form
- of cancer seems to have a high recurrence rate, and little is
- known about it, if you have *strictly* indoor-only cats, you may
- want to discuss with your vet if the risk of fibrosarcoma is
- greater than the risk of being exposed to FeLV if the cat gets
- out. This is an individual decision that will be different for
- each household. You should contact your vet immediately if you
- notice any lumps in the vaccine injection area.
-
- Do I have to get my cats vaccinated?
- No one can force you to vaccinate your pets, though there are laws in
- some areas regarding certain diseases like rabies. Check with your
- vet to see what vaccines are required in your area.
-
- My cats are indoors-only. Why should I bother getting them vaccinated?
- The answer to this question all boils down to a risk/benefit
- assessment.
- If you live in a high-rise, do not plan on moving in the next
- year, and do not plan on exposing your cat to other cats (such as
- getting a new kitten, or temporarily housing a stray), then there
- is really no need to get the cat vaccinated. If it is somehow
- possible for your cat to make it to the outside world, whether it
- be because of a break-in, or a landlord who forgets to close the
- window they just fixed, or a visitor doesn't realize the cat is
- not allowed outside (all of which are real-life cases of people I
- know whose indoor-only cats have gotten outside) then your cat is
- at SOME risk. Many people who lived through Hurricane Andrew or
- the LA Earthquake can tell you that some of their indoors-only
- cats ended up on the street for days. Fortunately disasters like
- these are infrequent, but the point is accidents can happen. In
- the few hours or days that your cat is outside it could come in
- contact with an infected cat, and it is better to give your cat
- that 75-85% boost to its natural resistance.
- But, some people feel the risk of adverse reaction and possible
- fibrosarcomas from vaccinating are not worth the risk if the cat
- is not likely to go be exposed to FeLV+ cats, even if it did get
- outside for a short period. What YOU as the cat's owner (not your
- vet, not your cat's breeder, not your friend of a friend who knows
- a lot about cats, and not someone who wrote something you read on
- the internet) must decide is how much risk is there for your cat
- getting out and being exposed, and is that risk worth the other
- risks associated with the vaccine?
-
- My cat is a purebred, and I've heard the vaccine should not be given
- to purebreds. The breeder I bought the cat from discourages getting
- the vaccine.
- This is a touchy subject because there is often the general feeling
- among vets that many breeders don't know what they are doing, and
- the feeling among breeders that vets don't know much about
- purebreds. There is probably a little bit of truth to both sides.
- It is true that some breeders may think they understand veterinary
- medicine better than they really do, and unfortunately rely on
- word-of-mouth advice of other breeders rather than vets (eg: "Jane
- Smith has been breeding for 15 years and she knows a lot so if she
- doesn't like this vaccine, it must be bad"). But it is also true
- that most vets do not deal specifically with purebred issues.
- There is no course in vet school called "Purebreds 101" and vets
- are often just as guilty as anyone in misidentifying mixed breeds
- as purebreds, of being too quick to diagnose a "breed specific"
- illness with less data than if they would if the cat were not a
- purebred, or of not being aware of conditions which may affect one
- breed more than another.
- Keep in mind that some veterinarians are also breeders, or work
- within the CFA, TICA, ACFA (AKC for dogs) or other purebred
- registries, and these vets are most likely going to be more
- knowledgeable about conditions which are more common to certain
- breeds. Also remember that not all purebreds are the same, each
- breed is different and has its own characteristics. Just like you
- can't say "don't vaccinate Europeans for smallpox," because there
- are *many* different cultural and ethnic groups in Europe.
- The immune system of purebred cats has NEVER been tested to
- determine if it is different than that of mixed breed cats. It is
- impossible to state one way or another if the purebred immune
- system, because of inbreeding, has any reason to adversely react
- to vaccines that are tested on a largely mixed-breed cat
- population. Some people feel there is a significant difference
- between the two based on antecdotal evidence and won't vaccinate
- for that reason, and some people feel this is nonsense.
- But that doesn't answer the question because this one is going to
- have to be answered by you and your own gut feeling. Who do you
- trust more with the combined necessary knowledge of vaccines, as
- well as about your purebred? Talk to your breeder and see if s/he
- is aware of the vet literature, or is repeating word-of-mouth
- arguments. Many of them are well aware, many read the literature
- more than vets do, so don't be afraid to ask them why they hold
- the opinions they do. Talk to your vet and ask how familiar they
- are with your partiuclar breed of cat as well as purebreds in
- general. Get a feel for both. Keep in mind that many breeders do
- not vaccinate their own breeding cats because FeLV vaccines can
- cause miscarriages and stillbirths, or it may just be cheaper for
- the breeder to test their cattery every year and every cat that
- comes into the cattery rather than to vaccinate, especially as
- cats from a cattery are less likely to escape to the outside world
- (remember the risk/benefit assessment above). Make sure you find
- out exactly why the breeder does not recommend the vaccine as it
- may very well be that the breeder has had numerous negative
- experiences with the vaccine in his/her particular line of cats,
- and that your cat may be genetically predisposed to have a bad
- reaction. If this is the case, you should still discuss the matter
- with your vet, and it may be best not to get the vaccine.
-
- My cat gets sick after it gets vaccinations. Why should I put my cat
- through that?
- Some cats do have bad reactions to vaccines. However, it is better to
- have a cat sick for one day per year from being vaccinated than to
- have it die a miserable death from an FeLV-related disease. If
- your cat has a bad reaction to a shot, ANY shot, and the reaction
- lasts more than 12-24 hours, you should immediately bring your cat
- to the vet. Even if your cat has a mild reaction, you should at
- least discuss the matter to see what are the best options for next
- year's vaccinations. It may be best to spread your cat's annual
- vaccinations out over a few months, or have them all administered
- at once. If your cat has had a *very* bad reaction, it very well
- may be best to discontinue vaccinating for FeLV. Definitely
- discuss this with your vet.
-
- I already have a cat(s) and I found another which I want to bring
- home. What precautions should I take regarding FeLV (and other
- diseases)?
- This depends on the environment the new cat comes from. If it is a
- stray, or from a shelter which does not routinely test for the
- viruses (make sure you ask this of any shelter you visit), or from
- a household where you have reason to doubt the person has had the
- cat tested/vaccinated, then keep the new cat separated from yours
- until you can have a vet examine it for many things. Keep it in a
- separate room and provide its own food dish, water bowl and
- litter. DO NOT let your cats share any of these things, or share
- the same space, until your vet checks out the new one. If it is a
- stray cat, it may never have been vaccinated against FeLV and
- Rabies, or if it was a housecat it may be past its time for an
- update and have been exposed. Cats which have been on the street
- may also have fleas, tapeworm, ringworm or other parasites which
- are transmittable to you and your pets.
- One of the most unfortunate situations that occurs far too often
- is when someone, out of the kindness of their heart, takes in a
- stray or unwanted cat -- either permanently or in the hopes of
- finding it another home. This is often done spur-of-the-moment,
- and unfortunately sometimes has dire consequences. If you find a
- cat in a bad situation and you want to help it, keep it isolated
- or ask your vet to board it until all the test results have
- returned. It is never worth the lives of your current pets in an
- attempt to save another.
-
- How is FeLV detected?
- Your vet will do a blood test; there are two types of blood tests
- which can be performed. Some vets will automatically do one of the
- tests before vaccinating your cat to make sure it is not already
- positive for the virus. The first (ELISA test) is where the vet
- takes some of your cat's blood, mixes it with a chemical and
- watches for a color change. If the blood changes color then your
- cat has tested positive for the virus. False positives are not
- uncommon in this form of test, so if your cat tests positive it
- may be a good idea to have it retested. "Light positives" are
- where the treated blood only changes color slightly. This means
- your cat is infected with the virus, but the virus is not very
- active in its system. The second type (IFA test) involves sending
- the blood sample to a special lab. This lab tests to see if the
- virus is being produced in the bone marrow. If this second test is
- positive, it is unlikely that your cat will ever test negative.
- Below is a flow chart (from a lecture by Dr. William Hardy, U of
- Penn. Vet School) which depicts what you should do if your cat
- tests positive on the ELISA test:
-
- * If positive:
- + whether healthy or sick, confirm by Indirect Fluorescent
- Antibody test (IFA)
- * If negative:
- + if healthy and not exposed to a positive cat then no need to
- retest
- + if healthy but exposed to a positive cat then retest in 3
- months because the healthy cat may be incubating the virus.
- + if sick then confirm the ELISA test with an IFA test
-
- So some cats who test positive can later test negative?
- Yes. If you have a cat which tests positive on the ELISA test, you
- should immediately have an IFA test done. If it tests negative on
- the IFA test, you should have your cat retested with the ELISA
- test in 3 months. If a cat does not test negative again in roughly
- three months, chances are it will always test positive. Vets and
- virologists have devised an entire classification scheme of the
- different types of infected cats (transiently infected,
- persistently infected, etc.) based on the ELISA and IFA tests. It
- can be very confusing and if you are interested in learning the
- details you should consult with your vet regarding your particular
- cat's status.
-
- Is it possible for a cat to test negative when it really is positive?
- Unfortunately, yes. Although false negatives are not very common, they
- do occur, especially if you are dealing with a young kitten.
- Sometimes the cat has been recently exposed to FeLV, so the
- antibodies have not yet had enough time to build up enough of a
- response to appear on the test. To be absolutely sure a cat is not
- FeLV+ you should test it twice, a few weeks apart (the cat should
- remain isolated from other cats during this period, too, otherwise
- there is little point in doing a second test). The likelihood of
- getting a false negative is increased depending on the nature of
- the test. The ELISA test will show more false negatives than the
- IFA test. Some mail-order catalogues now offer FeLV testing kits
- using saliva or tears as the medium. These are more likely to
- trigger a false response than the ELISA test which uses blood.
- Fortunately, the false negative rate on the ELISA test (which is
- what most vet offices use for standard FeLV tests) is low enough
- that most people don't bother with the second test.
-
- How long does a cat who tests positive have to live?
- There is no set time period for how long an FeLV+ cat will live. One
- person on the internet said they had a cat which lived for 20
- years with the virus, while others have given dates as long as 10
- or 12 years, although these are probably extremes. I have not
- found any truly long-term studies to document, but it seems that
- of the studies done, 83% of FeLV+ cats do not live beyond 4 years.
- (Hardy, et al 1980). All cats which do not later test negative,
- but in all other ways are healthy, are carriers for the virus.
- Even though they do not have acute symptoms, they can still spread
- the virus to cats which are not infected. Often people do not have
- their cat tested for the presence of FeLV until the cat is
- noticeably sick, and by this time the FeLV-related disease may
- have progressed too far for the cat to recover.
-
- What are symptoms for which I should be on the lookout?
- Unfortunately, since FeLV is a retrovirus that attacks your cat's
- immune system, your cat can become ill from many things as a
- result. This makes looking for a 'sure sign' very difficult. Often
- the immune system is weak so your cat will become chronically
- infected with certain conditions such as stomatitis, gingivitis,
- oral ulcers, abscesses and non-healing wounds of the skin, upper
- respiratory infections or FIP. Some cats whose digestive tracts
- are affected have been described as staring at their food bowl
- seemingly unable to remember how to eat, or their breathing will
- be very difficult and loud. Basically, whenever your cat shows
- chronic, peculiar and/or unhealthy behavior, take it to a vet to
- be examined.
-
- My cat recently passed away from FeLV. How long should I wait before
- getting another cat and are there any special precautions I should
- take?
- Well, your own grief issues aside, from a medical point of view you do
- not need to wait very long. The virus is fragile outside the host,
- and I know of one vet who has even stated that it would be safe
- the next day. Personally, I would wait a week at least. You should
- definitely discard the litter box and food/water bowls, or else
- clean both well with household detergents or a 1:32 bleach
- solution.
- _________________________________________________________________
-
- PART II: If your cat has tested positive
-
- Some of these points are mentioned in the general section above, but
- here are more specific questions geared to people whose cats have
- tested positive. The most important point to stress is that FeLV+ cats
- *MUST* be made indoors-only. This needs to be done for two reasons.
- First, the more you expose your cat to outside ills, the more likely
- it is to contract an FeLV-related disease or infection. The second
- reason is that FeLV+ cats are like Typhoid-Marys to any other cat they
- meet. As noted above, the vaccine is only 75-85% effective, so any
- vaccinated cat that your cat encounters is at risk, as well as any
- unvaccinated cat. If these cats are then infected and they continue to
- interact and infect other cats, then you could give rise to an
- epidemic in your area. If you cannot or will not keep your FeLV+ cat
- indoors, than the only humane thing to do is find a home for it with
- someone who will (ways to do this are suggested below), or have your
- cat put to sleep. This may sound extreme, but it is extremely selfish
- to allow your cat to roam the neighborhood possibly infecting all the
- local outdoor cats just because you refuse to keep your cat indoors.
- Keeping your cat indoors is one of the responsibilities of owning an
- FeLV+ cat.
-
- My cat has tested positive. Should it be put to sleep?
- The mere fact of testing positive is not enough to merit putting a cat
- to sleep, although there may be other significant factors involved
- which do make putting the cat to sleep the best option. There are
- vets who recommend putting all FeLV+ cats to sleep. If your vet
- recommends this and you feel comfortable with that decision, then
- that is the best solution. Sometimes putting an FeLV+ cat to sleep
- is the best option for the cat, especially if it has acute
- symptoms and is in pain. This is never an easy decision and one
- which should not be taken lightly. If you do not feel you are
- capable of emotionally dealing with having an FeLV+ cat (or cannot
- keep the cat indoors), but do not want to put the cat to sleep,
- there are other alternatives which are discussed below. The one
- thing you should not do is ignore the virus. If your cat has
- tested positive, then you have a responsibility to take some
- action. FELINE LEUKEMIA VIRUS WILL NOT GO AWAY IF YOU JUST IGNORE
- IT!
-
- What will happen to my cat now that it has tested positive?
- Because there are so many different ways to respond to the presence of
- the virus, it is impossible to predict exactly what will happen
- (and when it will happen) to your cat. I've noticed that any 5
- vets you ask will give you 5 different answers to this question.
- The scientists who experiment and publish on the disease are also
- in disagreement. I have presented two different (published)
- viewpoints below. According to Hardy, et al (1980), (and these
- people seem to be the authorities on the disease) roughly half of
- all cats who test positive (and do not test negative again within
- a three month period) are persistently infected and show acute
- signs of FeLV-related diseases. The other half are latently
- infected and are in all other aspects 'healthy' although they are
- still carriers. 17% of all cats which test positive (and do not
- later test negative) will live past 4 years. The next point of
- view is taken from a much more recent article and has radically
- different statistics. According to Loar (1993), of cats which test
- positive for the disease only 5% will immediately become infected
- with an FeLV-related disease. The other 95% will enter the latent
- phase which will last for months to years. These 95% are still
- carriers for the disease and can infect other cats.
-
- Although my cat has tested positive, it is healthy in all other
- respects. How can I prevent an FeLV-related disease from becoming
- active in its system?
- There is no sure way to keep your cat healthy. Eventually, an
- FeLV-related disease will probably develop no matter what you do.
- However, one way in which a disease is likely to develop is if you
- stress your cat's system. If a cat's system is stressed, its body
- can't put as much energy into fighting off illnesses (just like
- you always seem to get sick during exams or when you have to make
- a presentation to your boss). "When all my cat does is eat and
- sleep 20 hours a day, how can it possibly be stressed?" you may
- ask. Anything which is upsetting or unpleasant for your cat may
- stress it, such as going for very long periods without food or
- water, overcrowding, movement to new territory, territorial
- conflicts, sending your cat to be boarded for long periods of
- time, or pregnancy and lactation. (Of course one should NEVER
- breed a FeLV+ queen as it will expose not only the tom, but all
- the kittens will be FeLV+. There is also an indication, although
- no proof, that FeLV causes abortions in queens. For the same
- reasons, neither should FeLV+ toms be bred.) Basically, keep in
- mind things which you have noticed in the past that seriously
- upset your cat. These are things which are more likely to lower
- your cat's natural immune system and give a disease the chance to
- attack.
-
- I have an FeLV+ kitten that I have decided to keep. Should I have it
- neutered/spayed?
- I've only encountered one case of a vet recommending not to spay a
- kitten because it was FeLV+. Unfortunately, going into repeated
- heat cycles was very stressful on her, and that owner believes it
- caused her to suffer ill effects of the disease sooner than she
- may have otherwise (of course there is no proof to this). It is
- true that there is a small added risk to anesthetizing an FeLV+
- cat, but that risk will well worth the alternatives. Especially
- since a whole cat will have a very strong desire to roam, thus
- further spreading the disease. In my personal experience, my vet
- did a very careful screening to make sure my FeLV+ cat could
- handle the anesthesia before operating. It really should not be
- much of a problem, but always make sure if your cat needs surgery
- that you remind the vet and staff that your cat is FeLV+.
-
- Should I continue to vaccinate my cat if it is FeLV+?
- The literature recommends against continued FeLV vaccinations. Other
- feline vaccinations (panleukopenia, rabies, etc.) should be
- continued.
-
- I have had several cats for a long time. One of them recently tested
- positive, but the others have not. Do I need to get rid of the FeLV+
- one?
- This is a tough situation, for which there is no pat answer. You
- should discuss the matter with your vet. One vet I spoke with felt
- that chances are the other cats have already been exposed and it
- is probably best to just keep them up on their vaccinations and
- not change the household drastically. One study (Barlough, 1984)
- says that in a survey of 45 households from which FeLV+ cats were
- removed, 99.5% of the FeLV- cats remained negative. However
- households in which the FeLV+ cats were not removed had infection
- rates 40 times greater. It is probably best to remove the infected
- cat if it can be sent to a good home without causing too much
- disruption in your household, and your mental psyche.
-
- I have an FeLV+ cat and I want to find it a playmate. What should I
- do?
- There a few options. The only thing which you really ought NOT to do
- is get a healthy cat as a playmate or let your cat outside for
- excitement. Dogs cannot become infected with the Feline Leukemia
- Virus, and some dogs and cats, especially those raised together
- can be very close. One word of warning: getting a dog (or any pet)
- for the sole reason of keeping a cat company is not a good idea.
- If you consider getting a dog, make sure you understand the amount
- of time and responsibility that goes into caring for a dog (which
- is much more than that of a cat); otherwise you will regret the
- decision and both you and the dog will suffer. (There are
- excellent dog FAQs which will give you as much information on the
- matter as you can handle).
- Another option is getting a second FeLV+ cat. The obvious down
- side is that you not only have twice the vet bills, but you also
- put yourself at risk for twice the heart-ache when one or both
- become ill. However, if you are willing to take the risk you can
- search for FeLV+ cats by putting an ad in the newspaper and
- calling all your local vets and animal shelters and explaining
- your situation. They may put you on a list and should they receive
- any cats which test positive, they may give you a call. Make sure
- you give your current vet as a reference as most shelters and
- other vets will want to make sure you understand the
- responsibility of owning an FeLV+ cat or to make sure that you are
- not some psychopath looking for sick kitty-cats to do nasty things
- to (of course most people, especially your relatives, will think
- you are a psychopath anyway, for keeping and seeking out more
- FeLV+ cats).
-
- I have an FeLV+ cat that is otherwise healthy, I do not want to put it
- to sleep, but I can't keep it. What can I do?
- Similar to the above answer, place ads in the newspaper and contact
- your local shelters and vets and tell them you have an FeLV+ cat
- which you are willing to give to a good home. A good home is
- someone with another FeLV+ cat, or someone who does not have any
- other cats and will keep the cat indoors. Also, there are animal
- shelters which specifically take in FeLV+ cats. Again, contact
- your local vets and shelters to see if they are aware of any such
- haven to which you could send your cat. Almost all regular
- shelters will put to sleep any cat they receive which tests
- positive because the virus is so contagious. If you are going to
- do this, however, you should understand that is it unlikely that
- you will get instant results. If you expect to find a new home for
- an FeLV+ cat within a few days of making inquiries, you can pretty
- much forget it. Be prepared to hold on to the cat for a few weeks
- at least, while searching for a new home.
- One organization you may want to contact is the:
- MILLER-ROTH Animal Organization
- 2000 E. Broadway #141
- Columbia, MO. 65201
- (573) 657-9633
- http://www.geocities.com/~miller-roth/felv.html
- They have a 4-page factsheet on how to go about finding a FeLV+
- cat a home that they will be happy to send it to anyone who sends
- them a business-sized self-addresed STAMPED envelope or contact
- them via email. Please contact them via email first, as this will
- save everyone time, postage and paper costs. If that is
- impossible, be sure to send them an SASE, as the extra expense of
- paying postage would be quite a drain on their already low funds.
- (Donations are always welcome, of course).
- If you choose to put an ad in the paper you MUST take the
- responsibility of making sure the people who express interest in
- your cat are doing so for legitimate reasons. You should interview
- them in person and check references if possible. There are people
- who will lie to get cats to feed to other pets, to sell to labs or
- to abuse. Think about this as you interview each potential
- candidate.
- _________________________________________________________________
-
- References
-
- * CancerNet Factsheet is available via gopher to gopher.nih.gov
- following the menu path Health and Clinical Information/CancerNet
- Information/Fact Sheets from the NCI/Risk Factors and Possible
- Causes. Or you can call the Cancer Information Service toll free
- at 1-800-422-6237 (1-800-4-CANCER).
- * Hardy, William D., Essex, Myron, and McClelland, Alexander J.
- (eds). Feline Leukemia Virus. Elsevier/North-Holland, Inc. New
- York, 1980.
- * Loar, Andrew S. "Feline Leukemia Virus: immunization and
- prevention" in Veterinary Clinics of North America: Small Animal
- Practice. 23(1):193-211, 1993.
- * Barlough, J.E. "Seriodiagnostic aids and management practice for
- retrovirus and coronavirus infections" in Veterinary Clinics of
- North America: Small Animal Practice 14(5):955-969, 1984.
- * Olsen, R.G. et al "Oncogenic viruses of domestic animals: in
- Veterinary Clinics of North America: Small Animal Practice
- 16(6):1129-1144, 1986.
-
- Additional Readings
-
- * Hardy, W.D. Jr, et al. "Biology for Feline Leukemia Virus in the
- natural environment" in Cancer Res. 36:582, 1976.
- * McClleland, A.J. et al. "Prognosis of healthy Feline Leukemia
- Virus infected cats" in Rev. Cancer Res. 4:121, 1980.
- * Rojko, J.L., and Hardy, W.D. Jr. "Feline Leukemia Virus and other
- retroviruses" in The Cat: Diseases and Clinical Management, NY:
- Churchill Livingston, 1989.
- * Rojko J.L. et al. "Reactiviation of latent Feline Leukemia Virus
- infection" in Nature (Lond.) 198:385, 1982.
- * Also, the Journal of the Am. Vet. Med. Association, 199(10), Nov.
- 15, 1991 is devoted entirely to feline viral diseases.
- _________________________________________________________________
-
- This article is Copyright (c) 1995 by [ ermiller@dgsys.com]
- All rights reserved, please ask about redistribution.
- This URL is: http://www.dgsys.com/~ermiller/FeLV.html
- _________________________________________________________________
-
- Other FeLV sites of interest
-
- http://web.vet.cornell.edu/public/fhc/felv.htm, from the Cornell
- Feline Health Center
- http://www.angelfire.com/il/felv Newer Methods For Treating FeLV+ Cats
- (make sure you discuss these options with your vet)
- http://www.geocities.com/Heartland/Ranch/6167/ FeLV support site
- _________________________________________________________________
-
-