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Time of infection with Salmonella to detection of the organism in faeces

H. Aceto, S. A. Miller, G. Smith

IN human medicine, the Centers for Disease Control and Prevention define the time from infection with Salmonella to shedding of the organism in the faeces as one to three days (although sometimes longer). This study evaluated the time from infection in animals to the first detection of Salmonella in the faeces, and the onset of clinical signs, to see whether the three-day criterion could be used to identify nosocomial infection in animals.

The literature was searched for journal articles, theses and book chapters that contained studies in which cattle, horses and sheep were experimentally infected orally with Salmonella enterica subspecies enterica. The time to detection of Salmonella in faeces and onset of diarrhoea and pyrexia were recorded, as well as host species, age at infection, Salmonella serovar and magnitude of infective dose. Analysis of covariance was used to examine any relationships between these variables.

Forty-three studies met the inclusion criteria. Two studies were published in the 1920s, 15 in the 1970s, and there was a median of four studies from each of the other decades between 1940 …

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