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Journal of Bacteriology 1963-Apr

DIRECT AND INDIRECT FLUORESCENT-ANTIBODY TECHNIQUES FOR THE PSITTACOSIS-LYMPHOGRANULOMA VENEREUM-TRACHOMA GROUP OF AGENTS.

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M R ROSS
E K BORMAN

Märksõnad

Abstraktne

Ross, Martin R. (Connecticut State Department of Health, Hartford) and Earle K. Borman. Direct and indirect fluorescent-antibody techniques for the psittacosis-lymphogranuloma venereum-trachoma group of agents. J. Bacteriol. 85:851-858. 1963.-Direct and indirect fluorescent-antibody (FA) techniques were developed for the detection of group antigen in infected tissue cultures and the titration of group antibody in human antiserum. The growth of the agent of meningopneumonitis (MP) in mouse embryo lung cell monolayers was followed by infectivity and complement-fixing (CF) antigen titrations, and cytological examination of FA stained cultures. Although infectivity and CF antigen reached a peak at 2 days and remained constant for an additional 3 days, only cells tested 2 to 3 days after infection were suitable for FA staining with labeled anti-MP serum because of excessive artifacts in the older cultures. Fluorescein isothiocyanate-labeled rooster and guinea pig anti-MP serums and human antipsittacosis serums were titrated in direct FA and hemagglutination-inhibition (HI) tests. The rooster conjugate showed brighter staining and higher antibody titers than the guinea pig or human conjugates and was more effective in detecting minimal amounts of virus antigen. FA staining reactions with 1 and 2 units of labeled rooster serum were inhibited by unlabeled rooster serum but clear-cut inhibition with human antipsittacosis serum could not be demonstrated. The indirect FA technique was successfully used for the titration of group antibody in human serum. A comparison of the indirect FA, HI, and CF tests showed the indirect FA technique to be intermediate in sensitivity between the HI and CF tests. None of the three tests showed significant cross reactions with human serums reactive for influenza A and B; parainfluenza 1, 2, and 3; respiratory syncytial virus; Q fever; or the primary atypical pneumonia agent.

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