Table 2 Relative abundance (% of all infections in snails) of cercariae morphotypes found in snails collected in small canals, rice fields and fish ponds in in two communes, Nhgia Lac and Nhgia Phu, in Nam Dinh province, northern Vietnam
Morphotypes of cercariae | No. of infected snails | Relative abundance (%) | No. of infected snail species | No. of sites where found | ||
|---|---|---|---|---|---|---|
|  |  |  |  | Small canals (n = 30) | Rice fields (n = 30) | Ponds (n = 30) |
Echinostome cercariae | Â | Â | Â | Â | Â | Â |
 Type 1 | 495 | 26.3 | 7 | 9 | 6 | 17 |
 Type 2 | 27 | 1.4 | 2 | 2 | 1 | 1 |
Pleurolophocercous cercariae | Â | Â | Â | Â | Â | Â |
 Type 1 | 360 | 19.2 | 4 | 8 | 4 | 17 |
 Type 2 | 379 | 20.2 | 4 | 9 | 5 | 16 |
 Type 3 | 19 | 1.1 | 1 | 1 | 1 | 2 |
 Type 4 | 18 | 1.0 | 4 | 3 | 2 | 2 |
Other | Â | Â | Â | Â | Â | Â |
 Amphistome cercariae | 2 | 0.1 | 2 | 1 | 1 | 0 |
 Furcocercariae | 6 | 0.3 | 3 | 0 | 2 | 2 |
 Gymnocephalous cercariae | 34 | 1.8 | 3 | 1 | 0 | 4 |
 Monostome cercariae | 69 | 3.7 | 3 | 3 | 0 | 9 |
 Opthalmoxiphidiocercariae | 2 | 0.1 | 1 | 1 | 0 | 0 |
 Xiphidiocercariae | 469 | 25.0 | 6 | 10 | 10 | 16 |