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1996-03-04
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Document 0547
DOCN M9640547
TI Effect of leukocyte concentration and inoculum volume on the laboratory
identification of cytomegalovirus in peripheral blood by the
centrifugation culture-antigen detection methodology.
DT 9604
AU Lipson SM; Falk LH; Lee SH; Jane and Dayton Brown and Dayton T. Brown,
Jr., Virology; Laboratory, Department of Medicine, North Shore
University; Hospital-Cornell University Medical College, Manhasset, NY
11030,; USA.
SO Arch Pathol Lab Med. 1996 Jan;120(1):53-6. Unique Identifier : AIDSLINE
MED/96136017
AB OBJECTIVE--To investigate the rate of Cytomegalovirus (CMV) detection in
peripheral blood by shell vial assay-indirect immunofluorescent assay
technology using two leukocyte inocula concentrations and different
inoculum volumes containing equivalent cell concentrations.
DESIGN--Leukocyte inocula concentrations of 2 x 10(5) and 4 x 10(5)
cells per 0.2 mL were assayed for the presence of CMV by shell vial
assay-indirect immunofluorescent assay. The effect of different inoculum
volumes (0.2 and 0.4 mL) containing an equivalent cell concentration of
4 x 10(5) was evaluated as well. The data were compared to conventional
MRC-5 tube cultures, including blind passage. PATIENTS--Ninety-five
patients (101 specimens) were tested sequentially. The test population
consisted primarily of patients suffering from the acquired
immunodeficiency syndrome. SETTING--The diagnostic virology laboratory,
acquired immunodeficiency syndrome clinics, and hospital wards.
RESULTS--Among the 101 specimens tested by shell vial assay-indirect
immunofluorescent assay, the rate of CMV sensitivity increased by 36%
using the higher leukocyte inoculum concentration of 4 x 10(5) cells per
0.2 mL (P = .002; Cochran's Q test). No significant difference in CMV
yield was identified using equivalent cell concentrations with inocula
volumes of 0.2 or 0.4 mL. The CMV sensitivity rate using the higher
leukocyte inoculum surpassed that obtained by conventional tube
culture-blind passage. CONCLUSION--These data denote the importance of
leukocyte concentration on the rate of CMV detection in peripheral blood
by the shell vial assay-indirect immunofluorescent assay. The data also
point out the need to establish a standardized blood preparation
protocol to achieve optimal clinical relevance of this widely used
laboratory test.
DE Antigens, Viral/*ANALYSIS AIDS-Related Opportunistic
Infections/*DIAGNOSIS Cells, Cultured Centrifugation
Cytomegalovirus/IMMUNOLOGY/*ISOLATION & PURIF Cytomegalovirus
Infections/*DIAGNOSIS False Negative Reactions Fluorescent Antibody
Technique, Indirect Human Leukocyte Count Neutrophils/*VIROLOGY
Predictive Value of Tests Reproducibility of Results Sensitivity and
Specificity Support, Non-U.S. Gov't Viremia/*DIAGNOSIS JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).