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Ann Intern Med. 1930;3(12):1288-1291. doi:10.7326/0003-4819-3-12-1288
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In 1879 Ritter observed a house epidemic of severe pneumonia which he thought could be referred to a contagion from parrots, or rather from the cages in which the birds had been confined. The clinical and pathological pictures were those of an atypical pneumonia. Ost saw similar cases in 1882, and Wagner observed the same in 1882 and 1886. In 1891 the affection was introduced into Paris by some parrots imported from South America. In 1892 there was an epidemic of this disease in this city, in which fifty individuals were affected. During the next four years scattered cases were




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