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- W1913426703 abstract "Rapid diagnosis of Lassa fever is desirable for the timely therapeutic intervention and implementation of strict quarantine procedures both in West Africa field hospitals where the disease is endemic and at international crossroads. An enzyme-linked immunosorbent assay (ELISA) to measure Lassa virus antigens in viremic sera was developed in which experimentally infected monkeys were used as a model for the human disease. In this test, Lassa virus antigens in test sera were captured in wells of microtiter plates by monkey anti-Lassa virus immunoglobulin. Guinea pig anti-Lassa virus immunoglobulin was then added, and binding of specific immunoglobulin was quantitated by the addition of rabbit anti-guinea pig immunoglobulin followed by alkaline phosphatase-labeled anti-rabbit immunoglobulin. This test detected viremia titers as low as 2.1 log10 PFU/ml in experimentally infected monkey sera, a titer often exceeded in patients with Lassa fever. Inactivation of infectious virus by beta-propiolactone or gamma-irradiation did not diminish reactivity. Antigen-ELISA concentrations increased with infectivity for the first 10 days after infection but then declined while infectivity titers remained high, suggesting that the presence of humoral antibody in viremic sera diminishes the sensitivity of the antigen ELISA. Lassa virus-specific immunoglobulin M (IgM) titers measured in an IgM capture ELISA were detectable within 10 days of infection and peaked after 36 days but remained detectable for 1.5 years. The Lassa virus-specific IgG ELISA response was slightly delayed, peaking on day 73 but declining only slightly thereafter. These studies in a realistic primate model suggest that the antigen detection ELISA or the IgM capture ELISA described, in which beta-propiolactone-inactivated sera are used, should be useful for the rapid diagnosis of human Lassa fever." @default.
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- W1913426703 date "1984-08-01" @default.
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- W1913426703 title "Detection of Lassa virus antigens and Lassa virus-specific immunoglobulins G and M by enzyme-linked immunosorbent assay" @default.
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- W1913426703 doi "https://doi.org/10.1128/jcm.20.2.239-244.1984" @default.
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