Surveillance and analysis of <I>Salmonella</I> in Chongqing，2007

ObjectiveTo determine the infection rate, bacterial type, distribution and drug resistance associated with ISalmonella/I among diarrheal cases. MethodsCriterion of target cases and surveillance sites having been established, ISalmonella/I serotypes of diarrheal cases during outbreaks and those visiting the surveillance clinics were identified, and PFGE and drug resistance test conducted. ResultsThe infection rate of ISalmonella/I among diarrheal cases in Chongqing in 2007 8.74%. Ten ISalmonella/I serotypes were detected, mainly ISalmonella/I thompson and typhimurium. Peaks were seen in autumn. ISalmonella/I had led to ten outbreaks of diarrhea, occurring mostly in home or at community dinner parties, in which ISalmonella/I typhimurium constituted a major pathogen. Preserved eggs were the major risk. PFGE analysis of the 87 strains, 5 serotypes of ISalmonella/I revealed 3 genotypes of ISalmonella/I typhimurium and thompson but only one genotype in group B among affected babies. Drug resistance was shown in 10 ISalmonella/I serotypes against seven kinds of antibiotics. ConclusionISalmonella/I was one of the major pathogens leading to diarrhea epidemics. Strengthening the surveillance of preserved eggs was an important intervention to reduce the incidence.