[Strengthening the research and application of spatial epidemiology to promote precise prevention and control of parasitic diseases in China].

Spatial epidemiology is a new branch of epidemiology, and is a subject that mainly analyzes the geographical distribution and changes of population health or diseases and its related impact factors. Recently, spatial epidemiology has been extensively applied in the prevention and control of parasitic diseases in China, and delightful results have been achieved. However, the research and application of theories and methods of spatial epidemiology are still needed to protect the people's health in China.

[Relationship between natural extinction of snails and water chemical properties in Eastern Dongting Lake areas].

Objective: To investigate the reasons of natural extinction of snails by comparing the difference of the water chemical properties between the snail-breeding marshland and non-snail marshland in Eastern Dongting Lake areas.

Methods: Three adjoining marshlands in Eastern Dongting Lake areas were selected, one was a snail-breeding marshland, the second was a non-snail marshland, and the third was a boundary zone between them. During the periods of water-rising season, wet season and water-falling season, the water samples from the bottom of 0.

[Progress of spatial epidemiology applied to prevention and control of schistosomiasis].

Schistosomiasis is one of the key diseases of surveillance and prevention in China. The elimination of schistosomiasis is of great significance to people's health and social economy. With the development of spatial epidemiology, progress has been made in the spatial distribution of schistosomiasis, the prediction of spatial and temporal trends, and analysis of the environmental factors.