Pneumocystis cariniiPneumonia in the Adult

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Abstract
IN 1909 Chagas,1 in Brazil, described a peculiar pneumonia in a guinea pig infected with Trypanosoma cruzi that he ascribed to that parasite. Two years later, in the same country, Carini2 reported a similar disease in the lungs of rats experimentally infected with T. lewisi; he found numerous cyst forms in the alveoli and described them as the reproductive schizont forms of the organism. In the following year the Delanoës3 discovered the same cyst forms in the lungs of Parisian sewer rats and thus established the independent nature of the organism, which they named Pneumocystis carinii. Chagas4 subsequently . . .