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Table 1 Selected National Parasite Control Information Management System variables, China, 2009–2017

From: Change patterns of oncomelanid snail burden in areas within the Yangtze River drainage after the three gorges dam operated

Field survey variables Snail area variables
Province name Area of detected snails
County name Area of detected snails first time
Reporting year Total snail area
  Area of marshland/lake region inner embankment
  Area of marshland/lake region outside embankment
  Area of plains region with waterway network
  Area of hilly/mountainous region