SummaryEleven premature babies developed necrotizing enterocolitis in an epidemic of gastroenteritis and salmonella infection. This occurred in one of two premature baby wards over a period of 10 weeks. All affected babies had severe gastroenteritis and six had salmonella infection. No cases of necrotizing enterocolitis occurred in the unaffected ward during the same period. All other possible factors which might have predisposed to necrotizing enterocolitis occurred with equal frequency in both wards.There seems little doubt that infection was the significant factor in the pathogenesis.

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An epidemiological study of duodenal ulcer in Israel, based on 763 hospital admissions, is reported. Hospitalized patients, comprise a selected patient population (since not all duodenal ulcer are hospitalized) so that it is impossible to extrapolate from the presented data any conclusions about the frequency of the disease in the generalpopulation. Special features revealed by our analysis were the varying female/male (F/M) ratio with age of onset, ethnic group, profession and marital status. Some socio-cultural aspects are discussed in relation to their importancewith regard to the prevalence and incidence of the disease.