Control

Exposed

Reduction of cercariae shed

Number of cercariae

Number of snails at the end

Number of cercariae

Number of snails at the end

(%)

1^st week of infection

239,157

4

35,705

0

85.07

2^nd week of infection

12,410

5

11,430

4

7.89

3^rd week of infection

45,130

7

30,680

3

32.01

4^th week of infection

87,090

4

27,900

2

67.96

5^th week of infection

57,130

4

7,300

1

87.22

6^th week of infection

63,920

6

6,372

1

90.03

7^th week of infection

79,290

5

11,040

4

86.07

8^th week of infection

29,360

7

2,930

0

90.02

Total

613.487

42

133.357

15

78.26