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A cholera outbreak associated with eating uncooked pork in Thailand.

In a village near Chiangmai, Thailand, during October 1987, there was an outbreak of cholera following a funeral in which 264 attendants were served food. The present article is a report of an epidemiological study performed to identify the source of infection and the mode of its transmission. All the attendants were screened for infection by bacteriological examination of their rectal swabs and were kept under diarrhoeal surveillance. Of them, 20 patients and 40 matched controls were interviewed about the details of their eating foods served at the funeral. Vibrio cholerae 01, Inaba, El Tor was detected from 24 persons (9.1%), 15 of whom suffered from mild diarrhoea and the rest 9 had inapparent infections. There was no death. Except one butcher whose rectal swab was positive for the same strain of V. cholerae, 3 other butchers and 4 women who had prepared food were free from the infection. Food remnants were not available for culture. The water used for cooking and the water from the cement well used for slaughter were negative for the organism. The only significant association (p less than .01, odds ratio = 15) was found between an attack of cholera and eating laebmoo--an uncooked pork preparation with Thai spices and chili. The transmission of cholera appeared to have occurred through eating the uncooked pork presumably due to its contamination with V. cholerae shed by the infected butcher. He was known to have earlier visits to Chiangmai where cholera epidemic was going on.