Serological Differentiation of Primary Atypical Pneumonia from Virus Pneumonia of the Psittacosis Group.

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Abstract
In 11 cases of primary atypical pneumonia with increases in neutralizing antibodies for the new virus propagated in chick embryos (Eaton, M. D., G. Meiklejohn, and W. van Herick, Jour. Exptl. Med. 79: 649. 1944) no significant development of complement-fixing antibodies for agents of the psittacosis group were found. Ten of the patients had cold hemagglutinins and 7 showed significant titers of ag-glutinins for the indifferent streptococcus No. 344. In an additional 10 cases of virus pneumonia where the presence of an agent of the psittacosis group was demonstrated by virus isolation or complement fixation, no significant development of neutralizing antibodies for the virus of atypical pneumonia occurred. The serum of one of the latter 10 patients showed streptococcal agglutination at a dilution of 1:20 without change in titer.

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