[Comparison study on sampling methods of snail survey in marshland schistosomiasis epidemic areas in China].

Objective: To optimize and simplify the survey method of snail in marshland endemic region of schistosomiasis and increase the precision, efficiency and economy of the snail survey.

Methods: A quadrate experimental field was selected as the subject of 50 m×50 m size in Chayegang marshland near Henghu farm in the Poyang Lake region and a whole-covered method was adopted to survey the snails. The simple random sampling, systematic sampling and stratified random sampling methods were applied to calculate the minimum sample size, relative sampling error and absolute sampling error.