Investigation of an outbreak of Salmonella typhi in a public school in Madrid

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Abstract
A typhoid fever outbreak affecting 54 school students occurred in a Public School of Móstoles, Madrid. The date of onset was 11 June 1991 and the last detected case was 8 July 1991. Salmonella typhi was cultured from blood and/or stool samples corresponding to 54 patients and one food-handler. There were no secondary cases detected. Epidemiological investigation suggested a salad or a custard as the common source. Patients and the food-handler were treated with ampicillin/amoxicillin for up to three weeks. There were seven relapses that were also treated with the same antibiotics with success. None were found to be excreting the organisms when tested after four months. All the Salmonella ryphi isolated strains were phagetype 34, biotype Xylose +, Tetrationate Reductase + and harboured a similar 22 Mdal plasmid, they were also susceptible to the antibiotics tested.

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