Yes, they live in the south.

The snail is the intermediate host of schistosoma, which can cause schistosomiasis in humans, animals and poultry, seriously jeopardizing health. The key to controlling schistosomiasis is to eliminate the snail, eliminate the snail is equal to cut off the intermediate links in the life history of schistosomes. Elimination of snails can take artificial capture, trapping, deep burial, poisoning and other measures. According to the life pattern of the snail, it can be combined with farmland water conservancy construction in winter. Poisoning in April before the rise in temperature is the most appropriate, May after the poisoning will be applied to both injuries to the snail eggs of the drug, after June to eliminate the current year's young snails are the main.

Extended information:

According to the World Health Organization (WHO), schistosomiasis is prevalent in 75 countries and territories around the world, with a threatened population of about 600 million. Archaeological findings more than 2,100 years ago in China, there is an epidemic of schistosomiasis. The disease is prevalent in the Yangtze River basin in China and the vast areas of 13 provinces, municipalities and autonomous regions to the south, and the population threatened by schistosomiasis infection is about 100 million.

After the establishment of new China, China has carried out large-scale prevention and treatment of schistosomiasis and achieved great results, basically controlling the prevalence of schistosomiasis, and some areas have reached the basic elimination of schistosomiasis. In terms of schistosomiasis research, there are many areas that have reached the international advanced level.

Baidu Encyclopedia - Nail snail

Baidu Encyclopedia - Schistosomiasis