Etiologic surveillance for infectious diarrhea in Mentougou district of Beijing, 2013-2017

ObjectiveTo understand the pathogen spectrum of infectious diarrhea in Mentougou district of Beijing and provide evidence for prevention and control of intestinal infectious diseases.

MethodsStool samples were collected from the diarrhea patients receiving no antibiotic treatment in two large hospitals in Mentougou for the isolation, culture and identifications of Salmonella, Shigella, Vibrio parahaemolyticus and 5 kinds of diarrheagenic Escherichia coli (DEC). The patient data were analyzed with SPSS 20.0.

ResultsA total of 1 672 stool samples were collected from diarrheal patients, and 270 strains of pathogenic bacteria were detected. The overall positive rate was 16.15%. Among these strains, 121 (7.24%) were DEC, 65 (3.89%) were V. parahaemolyticus, 58 (3.47%) were Salmonella, and 3 (0.18%) were Shigella. Enterotoxigenic E.coli (ETEC) was the most common pathogen in DEC (30.36%), and Salmonella Enteritidis was the most common pathogen in Salmonella (8.50%). In addition, the detection of pathogenic bacteria had obvious seasonality. The detection rate was highest between May and August. There was no significant difference in detection rate between men and women (χ²＝0.685, P＞0.05).

ConclusionDEC was the main pathogen detected in stool samples of diarrhea patients in Mentougou, followed by V. parahaemolyticus and Salmonella. It is necessary to strengthen the surveillance for enteric pathogens, especially the pathogen spectrum of infectious diarrhea, for the prevention and control of infectious diarrhea.