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M94A2773.TXT
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1994-10-25
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Document 2773
DOCN M94A2773
TI The use of oral samples (crevicular fluid) to detect HIV-1 prevalence
rates.
DT 9412
AU Izazola-Licea JA; del Rio C; Guarner J; Lopez-Portillo M; CONASIDA
(National AIDS Council), Mexico D.F., Mexico.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):228 (abstract no. PB0341). Unique
Identifier : AIDSLINE ICA10/94369802
AB OBJECTIVE: HIV testing has been performed in different body fluids.
Crevicular fluid (CF) is a convenient biologic fluid to collect since it
is obtained non-invasively by rubbing the gingiva with the OraSure
device (EpitopeINC) which renders a non infectious mucosal transudate
rich in antibodies. Because of this advantages, we decided to test the
use of CF as a biologic sample to detect HIV-1 antibodies compared to
serum samples in a field study. METHODS: Paired samples of blood and CF
were collected from: a) 369 adult men in Mexico City, selected through a
probability survey and, b) 134 known HIV-1 positive individuals. In
addition, 1215 CF samples were collected from the same population survey
individuals without obtaining paired serum samples. All CF and serum
samples were tested for HIV antibodies by ELISA (Abbott, 2nd generation
assay). ELISA positive samples were confirmed by Western Blot
(WB)(Organon, Tecknika). RESULTS: From the paired 369 samples of the
population survey, ELISA was positive on 3 serum samples and 1 CF. On
confirmatory testing using WB only the pair positive on both serum and
CF was confirmed as a true positive. All 134 HIV-1 positive persons were
positive on serum, CF and WB. Of the 1215 CF samples from the population
survey 1 was positive on ELISA and confirmed by WB. We did not have any
indeterminate results on WB. Based on the total population survey (n =
1,584; 369 paired samples + 1215 CF samples), the HIV-1 infection rate
among adult males in Mexico City was 0.126% (or 1.26 per thousand men;
95% CI = 0.015-0.45%). DISCUSSION AND CONCLUSIONS: No false positive or
false negative results were found on the CF. In contrast, there were 3
false positive serum samples. Thus, the use of CF for HIV-1 testing for
public health surveys seems appropriate, particularly since CF is easier
to collect than blood by interviewers unskilled in blood collecting and
it is not considered a high risk fluid.
DE Adult Comparative Study Enzyme-Linked Immunosorbent Assay Evaluation
Studies Exudates and Transudates/*IMMUNOLOGY False Positive Reactions
Gingiva/*IMMUNOLOGY Human HIV Antibodies/*ANALYSIS/BLOOD HIV
Infections/DIAGNOSIS/*EPIDEMIOLOGY HIV-1/*IMMUNOLOGY Male
Mexico/EPIDEMIOLOGY Prevalence Sensitivity and Specificity Specimen
Handling/INSTRUMENTATION MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).