Morphological Characterization of Emerging Cercariae among Lymnaeid Snails from Barangay Cawongan, Padre Garcia, Batangas, Philippines

Table 2

Number of infected snails in the different months of collection and after different light exposure periods as monitored by cercarial shedding.

	Number of snails collected	Number of Infected snails	Odds Ratio (95 CI)
Total Number	750	267 (35.6)
Month of Collection
November 2016	150	45 (30.0%)	-
December 2016	150	32 (21.3%)	0.63 (0.38 – 1.07)
January 2017	150	65 (43.3%)	1.78 (1.11 – 2.87)
February 2017	150	86 (57.3%)	3.14 (1.95 – 5.05)
March 2017	150	39 (26.0%)	0.82 (0.50 – 1.36)
Number of Light Exposures
One	150	44 (29.3%)	-
Two	150	55 (36.7%)	1.40 (0.86 – 2.26)
Three	150	55 (36.7%)	1.40 (0.86 – 2.26)
Four	150	56 (37.3%)	1.44 (0.89 – 2.33)
Five	150	57 (38.0%)	1.48 (0.91 – 2.39)

Each exposure group was composed of a total of 150 snails from 5 months of collection (n=30 snails/exposure/month).
Number of light exposures represents the number of times a given batch of snails received a 6-hour light exposure with an average ~1000 lux light intensity. There were no significant differences among the numbers of infected snails in the different treatment groups (p>0.05)
Values with the same letter are not significantly different from each other (p>0.05). Values with different letters are significantly different from each other (p<0.001).