Table 3. Distribution of S. japonicum infections in snails in 2006 and 2007.
| Villages | Years | Infected snails (%) | No. of total cercariae genotyped | Mean abundance* | No. parasite genotypes per snail (genotyping 10 cercariae per snail) | p† | p‡ | ||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |||||||
| Guanghui (M) | 2006 | 34(5.21) | 85 | 2.50 | 15 | 4 | 8 | 4 | 0 | 1 | 1 | 0 | 1 | <0.001 | 0.020 |
| 2007 | 39(8.11) | 140 | 3.59 | 4 | 10 | 9 | 5 | 3 | 4 | 2 | 2 | 0 | <0.001 | <0.001 | |
| Heping (M) | 2006 | 39(2.77) | 79 | 2.03 | 15 | 13 | 7 | 3 | 1 | 0 | 0 | 0 | 0 | <0.001+ | 0.003 |
| 2007 | 0(0/1243) | ||||||||||||||
| Xingzhuang (M) | 2006 | 31(2.70) | 81 | 2.61 | 7 | 10 | 6 | 4 | 4 | 0 | 0 | 0 | 0 | <0.001+ | <0.001 |
| 2007 | 27(2.55) | 72 | 2.67 | 4 | 12 | 3 | 6 | 1 | 1 | 0 | 0 | 0 | <0.001+ | <0.001 | |
| Longquan (H) | 2006 | 27(0.74) | 45 | 1.67 | 18 | 6 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | <0.001+ | 0.456 |
| 2007 | 30(1.32) | 67 | 2.23 | 9 | 11 | 5 | 4 | 1 | 0 | 0 | 0 | 0 | <0.001+ | <0.001 | |
| Longshang (H) | 2006 | 27(1.41) | 46 | 1.70 | 14 | 9 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | <0.001+ | 0.039 |
| 2007 | 27(1.13) | 53 | 1.96 | 7 | 14 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | <0.001+ | <0.001 | |
| Yuantou (H) | 2006 | 23(1.44) | 31 | 1.35 | 16 | 6 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | <0.001+ | 0.051+ |
| 2007 | 34(1.44) | 85 | 2.50 | 6 | 14 | 7 | 5 | 2 | 0 | 0 | 0 | 0 | <0.001+ | <0.001 | |
Note: * mean abundance is the number of cercariae genotypes per infected snail; † p is the p-value of Poisson distribution goodness-of-fit test; ‡ p is the p-value of Negative binomial distribution goodness-of-fit test; +, for one cell with an expected value less than 3 in calculation of the χ2 value under a given distribution. M, for marshland; and H, for hilly region.