For contaminated water sources and stagnant water, disinfect by spraying with bleach and other effective drugs; drain field water before harvesting rice or put pesticides on to treat it; wear protective clothing when working and try to wear long boots and rubber gloves; clean up the excrement of domestic dogs promptly and disinfect by treating with chlorine containing disinfectant solutions (e.g. 84 etc.) for 1-3 minutes to prevent contamination of the environment; wear gloves when cleaning up urine and faeces of domestic dogs.