Epidemic Characteristics of Acute Gastroenteritis Caused by Contaminated Drinking Water at a Summer Resort in Northeast Chongqing

doi:10.3969/j.issn.1001-568X.2019.04.0019

Abstract：OBjECTIVE To study and analyze the prevalence and epidemiological characteristics of an acute gastroenteritis caused by the contamination drinking water in rural summer residential areas in northeast Chongqing. METHODS Field environmental hygiene survey and case investigation for acute gastroenteritis patients were conducted on epidemic area on July 24-27, 2017. A case of diarrhea ≥3 beats/day was selected as the basis for the patients' judgment, and SPSS17.0 was used to conduct the statistical analysis. RESULTS The attack rate was 56.52％. The main clinical manifestations were diarrhea, abdominal pain, abdominal distension, nausea, vomiting, headache, dizziness, weakness and tenesmus. The incidence of morbidity on July 24 accounted for 44.62％. The morbidity of age group more than 40 was 38.46％. The morbidity of farmers was 50.77％. The differences of morbidity incidence among times, age groups and occupations had significantly statistics (χ2=12.446, P=0.006;χ2=10.788, P=0.026;χ2=8.032, P=0.045). The factory water and terminal water were tested, which the total coliform, heat-resistant coliform, Escherichia coli, and total number of colonies exceeded the standard, especially the heat-resistant coliform group heavily exceeded the standard (>1 600 MPN/100 mL). CONCLUSION The outbreak occurred in rural summer residential areas with high attack rate, and middle-aged farmers as the main population with higher morbidity incidence. The incidence would present a rapid decline in the trend or stop the disease after cutting off the polluted approach of drinking water.