Abstract
EVER since 1951, when the United States Public Health Service relaxed the interstate and foreign quarantine regulations for psittacine birds,1 there has been a great increase in the number of such birds, particularly parakeets, sold for household pets in this country. Coincidentally, the number of cases of psittacosis reported from various parts of the United States has risen considerably. Whereas a total of only about 25 to 30 cases were reported annually to the National Office of Vital Statistics for each of the years 1945 through 1951, this number increased to 135 in 1952, 169 in 1953 and 303 for . . .

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