Table 3 Number of snails examined for trematode infections (in bold) and number of snails infected with different cercariae morphotypes in two communes, Nhgia Lac and Nhgia Phu, in Nam Dinh province, northern Vietnam
| Â | Small canals | Rice fields | Fish ponds | All habitats | ||||
|---|---|---|---|---|---|---|---|---|
Snail taxon and cercariae type | No. of snails | P (%) | No. of snails | P (%) | No. of snails | P (%) | No. of snails | P (%) |
Melanoides tuberculata | 2618 | Â | 480 | Â | 4601 | Â | 7699 | Â |
 Parapleurolophocercous | 348 | 13.3 | 44 | 9.2 | 292 | 6.3 | 684 | 8.9 |
 Echinostome | 220 | 8.4 | 28 | 5.8 | 121 | 2.6 | 369 | 4.8 |
 Xiphidiocercariae | 110 | 4.2 | 26 | 5.4 | 189 | 4.1 | 325 | 4.2 |
 Other | 12 | 0.5 | 0 | 0.0 | 67 | 1.5 | 79 | 1.0 |
Other thiarids | 1986 | Â | 465 | Â | 3705 | Â | 6156 | Â |
 Parapleurolophocercous | 45 | 2.3 | 0 | 0.0 | 22 | 0.6 | 67 | 1.1 |
 Echinostome | 73 | 3.7 | 0 | 0.0 | 36 | 1.0 | 109 | 1.8 |
 Xiphidiocercariae | 14 | 0.7 | 0 | 0.0 | 57 | 1.5 | 71 | 1.2 |
 Other | 0 | 0.0 | 0 | 0.0 | 26 | 0.7 | 26 | 0.4 |
Bithynia fuchsiana | 155 | Â | 861 | Â | 23 | Â | 1039 | Â |
 Parapleurolophocercous | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 |
 Echinostome | 0 | 0.0 | 9 | 1.0 | 1 | 4.3 | 10 | 1.0 |
 Xiphidiocercariae | 14 | 9.0 | 50 | 5.8 | 3 | 13.0 | 67 | 6.4 |
 Other | 0 | 0.0 | 2 | 0.2 | 0 | 0.0 | 2 | 0.2 |
Stenothyra messageri | 1339 | Â | 236 | Â | 5 | Â | 1580 | Â |
 Parapleurolophocercous | 22 | 1.6 | 2 | 0.8 | 0 | 0.0 | 24 | 1.5 |
 Echinostome | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 |
 Xiphidiocercariae | 5 | 0.4 | 0 | 0.0 | 0 | 0.0 | 5 | 0.3 |
 Other | 1 | 0.1 | 0 | 0.0 | 0 | 0.0 | 1 | 0.1 |
Other species | 1512 | Â | 2231 | Â | 1365 | Â | 5108 | Â |
 Echinostome | 5 | 0.3 | 26 | 1.2 | 3 | 0.2 | 34 | 0.7 |
 Xiphidiocercariae | 0 | 0.0 | 1 | 0.0 | 0 | 0.0 | 1 | 0.0 |
 Other | 2 | 0.1 | 3 | 0.1 | 0 | 0.0 | 5 | 0.1 |