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*Reservior of infection in poulty, pigs, rodents, cattle, dogs
*Reservior of infection in poulty, pigs, rodents, cattle, dogs
*Cause enteritis and systemic infection (septicaemia and abortion)
*Cause enteritis and systemic infection (septicaemia and abortion)
*''Salmonella'' may be carried sub-clinically
*Some human strains cause enteric fever (''S. Typhi'' causes typhoid), also gastroenteritis, septicaemia or bacteraemia
===Characteristics===
===Characteristics===
*Single species, ''Salmonella enterica''
*Over 2400 pathogenic serotypes or serovars identified
*Facultative intracellular pathogens
*Non-lactose fermentor
*Non-lactose fermentor
*Do not produce urease or indole from tryptophan
*Do not produce urease or indole from tryptophan