Use of Modern Laboratory Aids in the Investigation of a Typhoid Fever Outbreak

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Abstract
An outbreak of 27 cases of typhoid fever is described, 23 of which were probably due to the ingestion of curd or fresh cheese at a local factory or were secondary to such cases. The cases occurred over a period of 17 months. Bacteriophage typing sepa-rated the Type C cases, due to the contaminated curd and cheese, from Type A cases, traced to food prepd. by 2 Type A typhoid carriers. Two typhoid carriers were found among the dairy farmers supplying the cheese factory. Typing showed one to be Type C and eliminated the other as the possible source of the outbreak, despite the fact that epidemiological evidence alone pointed more forcefully to the latter as the carrier responsible for the outbreak.

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