An epidemiological study ofSalmonellain a closed pig herd

Abstract
An epidemiological survey of salmonella infection in a closed herd of pigs is reported. The main cause of cross-infection resulted from the movement of animals, with subsequent mixing of infected and clean stock and exposure of non-infected animals to infected faeces. Pen-to-pen infection carried by farm attendants also proved important.An extended survey is at present being conducted to gain further information on the processes of cross-infection.
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