The most important way of cholera transmission is through water, and water transmission plays an important role in cholera, especially in places with poor sanitation, where rivers, ponds, lakes, and well water are highly susceptible to contamination. People in rural areas have the habit of drinking raw water, rinsing their mouths with raw water, scrubbing eating utensils, and soaking fruits and vegetables in summer, and these habits increase the chance of cholera transmission through water. Waterborne transmission can occur in violent pandemics, with patients mostly distributed along contaminated water sources, and cholera concentrations can be measured in water bodies. Epidemics can occur in areas with high immunity to the population, while outbreaks can occur in areas with low immunity.