We have investigated associations between gastrointestinal illness and water quality in the city of Cherepovets. Daily data on water quality at a water treatment plant for a period of four years, meteorological data, data on water treatment plant performance, and preliminary and final diagnoses of gastro-intestinal diseases, which covered the whole population of the city, were computerised and made available for analysis. The data included mean and maximal concentrations of residual chlorine, chlorine demand, mean and maximal turbidity, color, water and air temperature, rainfall, mean and maximal filtration velocities, ICD-9. codes, age, sex and occupation of cases. Collection of historical data was supplemented by a six month-long longitudinal survey with 100 families. Families maintained daily diaries of GI symptoms and episodes of exposures such as drinking non boiled water, swimming in surface water bodies, eating unusual food, etc. Self-reported rates of mild GI illness appeared to be over 300 times higher than officially reported rates. Although data are still being analysed, preliminary results of longitudinal and historical data analysis have revealed an association between self-reported gastrointestinal diseases and chlorine demand at a water treatment plant. It was also found that heavy precipitation during warm seasons was associated with elevated rates of GI illness. Results of the study will be used for risk assessment and information support .for decision making. Recommendations on modifications to monitoring methods and water quality improvement strategies will also be developed.
Learning Objectives: At the conclusion of the session, the participant in this session will be able to: 1.List water quality indicators, which are associated with rates of GI diseases 2.Articulate the statistical procedure for assessing between time-variant variables and daily rates of illness 3.Evaluate practical measures, which can be undertaken to improve water quality and reduce burden of GI diseases
Keywords: Water Quality, Infectious Diseases
Presenting author's disclosure statement:
Organization/institution whose products or services will be discussed: None
I do not have any significant financial interest/arrangement or affiliation with any organization/institution whose products or services are being discussed in this session.