Surveillance for pathogen spectrum of infectious diarrhea in Tongzhou district of Beijing, 2016–2018

ObjectiveTo understand the bacterial pathogen spectrum of infectious diarrhea in Tongzhou district of Beijing from 2016 to 2018, and provide evidence for the prevention and control of bacterial infectious diarrhea.

MethodsStool samples were collected from intestinal outpatient diarrhea patients of two sentinel hospitals of Tongzhou district for detection of related pathogenic bacteria. The molecular biology identification of Salmonella, Vibrio parahaemolyticus and diarrheagenic Escherichia coli was carried out according to serotype and virulence gene, and the epidemic characteristics were analyzed.

ResultsA total of 298 strains of pathogenic bacteria were isolated from 1 269 stool samples with a detection rate of 23.48%. The detection rates of pathogenic bacteria in different age groups were statistically significant (χ²＝33.584, P＜0.001). Among the positive strains, diarrheagenic E. coli was predominant (140/298, 46.98%), mainly EAEC and ETEC, followed by V. parahaemolyticus (73/298, 24.50%) and Salmonella (58/298, 19.46%). The seasonality of bacteria spread was obvious, mainly in summer and autumn. The major Salmonella serotype were S. Enteritis and S. Typhimurium. The serotype of V. parahaemolyticus was mainly O3:K6.

ConclusionFrom 2016 to 2018, pathogenic bacteria of infectious diarrhea in Tongzhou district were mainly diarrheagenic E. coli, V. parahaemolyticus and Salmonella were also the common pathogens of infectious diarrhea. It is necessary to strengthen the routine surveillance for pathogens of infectious diarrhea and health education in population at high risk, and risk factor investigation and prevention and control should be further strengthened.