GENUS: CITROBACTER It is gram-negative lactose fermenting motile rods, and opprtunistic pathogen. Medical important species is Citrobacter freundii. Citrobacter freundii is associated with urinary tract infection, wound infection and septicaemia in immunocompromised and chronically deblitated patients.
GENUS: SALMONELLA Most isolates of salmonellae are motile It grows readily on simple media It never ferment sucrose or sucrose Form acid +/- acid from glucose or mannose Species of medical importance are:
Clinical features: 1. Enteric fever It is caused by S.typhi and S.paratyphi, and transmitted by fecal-oral route via contaminated food and drinks Incubation period: 10-14 days Predisposing factors: .Reduced gastric acidity .Disrupted intestinal microbial flora .Compromised local intestinal immmunity