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The Incidence of Amebiasis Observed at a Chicago Hospital over a Twelve-Year Period

1. The incidence of amebiasis in 1999 patients and employees of the Research and Educational Hospital over a 12-year period (June 1930 to June 1942) is presented. The average of 7.9 per cent harboring amebas is below the 10 to 20 per cent generally quoted for the United States even though the high incidences of the epidemic years are included.

2. Routine examinations of 103 normally well persons showed about one half the incidence of amebiasis demonstrated in a group of 243 patients with gastrointestinal symptoms (0.97% and 2.05% respectively).

3. The incidence of E. histolytica infestation increased markedly around 1933–1934, the period of the Chicago amebic epidemic. The year 1938–1939 saw a decrease to 4+ per cent, which appears to be the norm for the population under consideration.

Received December 11, 1942.
¹ Read at the Thirty-eighth Annual Meeting of the American Society of Tropical Medicine, at Richmond, Va., November 10, 11 and 12, 1942.