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M9650925.TXT
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1996-03-30
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Document 0925
DOCN M9650925
TI [Detection of human immunodeficiency virus antigen both free and in
immune complexes]
DT 9505
AU Banfi NH; Minervini MV; Scoccia AE; Servicio de Laboratorio Central,
Hospital I.A.C. San Juan de; Dios, La Plata, Argentina.
SO Rev Argent Microbiol. 1995 Jul-Sep;27(3):123-9. Unique Identifier :
AIDSLINE MED/96124262
AB The aim of this work was to increase sensitivity in the detection of
antigens from HIV-infected patients, through a process of immune complex
dissociation without loss of antigenicity. 500 microliters of sera were
mixed with 100 microliters of PEG 12%, stored one night in refrigerator,
and centrifuged at 2000 g during 20 minutes. 200 microliters of buffer
AcH/Ac- (pH 3.5) were added to the sediment, and incubated at 37 degrees
C during one hour with periodic shaking. This was neutralized with 100
microliters of buffer TRIS/CIH (pH 8.6). The antigen was investigated in
the original sample, supernatant and sediment. Samples of 105 patients
with positive serology, confirmed by Western Blot following CDC
criteria, were processed. The antigen was detected in 62 (59%) samples
precipitated with PEG, but only 35 (33%) when conventional methods were
used. Applying statistics X2: 13.97, P < 0.001, a highly significant
association can be observed between PEG dissociation treatment and
antigen detection. 27 negative sera by the standard method became
positive in the whole sediment, and only 8 in the supernatant. In
addition, 40 negative sera were processed, which had not become positive
for the antigen by PEG treatment.
DE Antigen-Antibody Complex/*IMMUNOLOGY English Abstract False Negative
Reactions Human HIV Antigens/*BLOOD HIV Infections/BLOOD/IMMUNOLOGY
HIV Seronegativity HIV Seropositivity/BLOOD HIV-1/*IMMUNOLOGY
Polyethylene Glycols Precipitation Reference Standards Sensitivity
and Specificity JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).