Abstract
In August to October, 1970, a cholera El Tor outbreak with about 250 laboratory-confirmed cases occurred in Jerusalem and its surroundings. The main epidemiological features were: (1) the outbreak started simultaneously at three different points in the area; (2) the cases appeared sporadically, with no obvious links between them, (3) the outbreak remained limited to the Jerusalem area despite much traffic to and from other areas, and (4) those affected were mainly adults. The channels through which the infection was introduced and the primary mode of spread in the early stages of the outbreak were not elucidated. Yet it seems likely that after the Jerusalem sewage had become contaminated with vibrios from cases, mild cases, and carriers, vegetables irrigated with that sewage in surrounding villages constituted a major secondary vehicle for the spread of the infection.
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