Table 1.

Infection status of Opisthorchis viverrini sensu lato (s.l.) and virgulate cercariae in Bithynia siamensis goniomphalos over three consecutive seasons from the study area in northeast Thailand

Seasons	Mean daily temperature (°C) Mean ± SD	Mean daily rainfall (mm) Mean ± SD	Number of snails	O. viverrini		Virgulate cercariae
				Number of infected snails	Prevalence (%)	Number of infected snails	Prevalence (%)
Rainy	27.8 ± 0.3	6.5 ± 3.8	5,601	44	0.31	441	3.11
Cool–dry	25.4 ± 2.1	0.2 ± 0.3	6,102	149	1.05	965	6.80
Hot–dry	29.0 ± 0.7	4.8 ± 5.2	2,480	53	0.37	233	1.64
Total	−	−	14,183	246	1.73	1,639	11.55