Determining the effect of floods on dysentery would be beneficial for providing a basis for the policy making for dysentery control technologies. This study has indicated that the morbidity of dysentery during the flooded learn more months could be higher than the non-flooded month. During the flooded months, heavy rainfall may cause floods and change in the living environment. Due mostly to floods after extreme

precipitation, water-borne diseases outbreaks and epidemics have been associated with water sources for drinking and recreation.35, 36, 37 and 38 Bacillary and amebic dysentery, as the water-borne disease with cholera, hepatitis A, typhoid fever, and other gastrointestinal diseases, were caused by ingestion of water contaminated by human or animal faeces or urine containing Shigellae or the protozoan parasite E. histolytica. 39 During the initial stage of the flood, intense precipitation can mobilize pathogens in the environment and transport them into the aquatic environment, increasing the microbiological agents on surface water. 40 and 41 Floods adversely affected water sources and supply systems, as well as sewerage and waste-disposal systems. The contamination can be washed into water source, causing the local water quality seriously deteriorated and increasing the transmission of enteric pathogens

during the floods. 42 Our findings support that the morbidity of dysentery is higher in the summer with floods through the comparison between non-flooded and flooded months. Our selleck study has identified that the risks of

floods on dysentery vary among the three cities, which suggests 3-mercaptopyruvate sulfurtransferase that floods may affect dysentery via diverse means not only by contaminated water source or foods. Besides the deterioration of the infrastructure, floods also can cause population displacement and changes in population density.30 and 43 After controlling for the impacts of weather and seasonality, floods has contributed to an increased risk of dysentery with different RRs among the three cities. The reason for the difference in disease risks among the three cities is not clear. The occurrence or spread of a disease after floods was also affected by other factors such as public health services, population density and demographics, and socio-economic conditions. The reason for the various relative risks between the cities was probably due to the severity of flood and population density. In addition, public health services and socio-economic status were not same in the study areas. Zhengzhou, as the capital of Henan Province, has a higher level of economy, better infrastructure, and better health services and health care than Kaifeng and Xinxiang. Therefore, these advantages lead to a minimal risk of dysentery transmission and epidemics following floods. More population and larger density means more possibilities of transmission and infection.