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Prevalence and density of FZT infection in fish (a); snail density for three groups of host species (Thiaridae, Bithynia and Stenothyra) in ponds (b), small canals (c) and rice fields (d) together with rainfall and air temperature from July 2005 to June 2006 in two communes in Nam Dinh Province. The symbols for groups of snail hosts are the same in subfigures (b-d) and the black columns indicate density of FZT infected snails. NS = not sampled
