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J Virol. 1988 October; 62(10): 3779-3788

Development of a sensitive quantitative focal assay for human immunodeficiency virus infectivity.

Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, Hamilton, Montana 59840.

ABSTRACT

Accurate and sensitive quantitation of infectious human immunodeficiency virus (HIV) has been difficult to achieve. In this report, a quantitative focal immunoassay (FIA) for HIV was developed using human HeLa cells rendered susceptible to HIV infection by introduction of the CD4 gene via a retrovirus vector. Infected cells were identified by using human anti-HIV antibodies or mouse monoclonal antibodies specific for HIV together with secondary fluorescein- or peroxidase-conjugated antibody specific for mouse or human immunoglobulins. The assay identified cells infected with either wild-type or culture-adapted HIV isolates and was capable of detecting 1 positive cell in 10(6) cells. The FIA was also effective at detecting cell-free HIV, and in contrast to assays using A3.01, CEM, and other human leukemia cells, the FIA detected most wild-type HIV isolates. HIV neutralization could be determined by using the FIA, and two monoclonal antibodies reactive with HIV gp120 were found to neutralize only the LAV-IIIB strain of HIV. These monoclonal antibodies, as well as antibodies in serum samples from patients with acquired immune deficiency syndrome, were able to inhibit the spread of HIV infection in human lymphocyte suspension cultures but not in CD4-positive HeLa cells growing attached to plastic dishes.

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