The fresh water snail, Hippeutis(Helicorbis) cantori, caught from the rice paddies in Namyangju-gun, Gyeonggi-do, was found to be a new second intermediate host of E. cinetorchis in Korea. The metacercariae were found from 89(76.7 %) out of 116 snails examined and the average metacercarial burden was 4.7 per infected snails. Some developmental characteristics of E. cinetorchis were observed after experimental infection of the metacercariae to rats and mice.
Fig. 1 Hippeutis (Helicorbis) cantori, a kind of fresh water snail, found to be a new second intermediate host of E. cinetorchis (scale: 1mm).
2. Two metacercariae encysted in the soft tissue of H. cantori.
3. A metacercaria isolated from H. cantori, showing end group spines(ES).
4. An excysted metacercaria showing oral sucker(OS), pharynx(P) and ventral sucker(VS).
Fig. 5 Growth curves in the ratio of posterior body(posterior to ventral sucker) to whole body length by the age of worms in rats and mice. (EMC : excysted metacercariae)
Figs. 6-11 Developmental stages of E. cinetorchis recovered from albino rats.
6. A 2-day old worm.
7. A 3-day old worm.
8. A 5-day old worm showing an ovary, testis and uterine tubule.
9. A 7-day old worm showing cirrus pouch(CP), uterus(U), ovary(O) and a testis (T).
10. A 10-day old worm showing more convoluted uterine tubule(U), vitellaria(V) and Mehlis' gland(MG).
11. A 12-day old worm showing many eggs in uterus.
Figs. 12-17 Developmental stages of E. cinetorchis recovered from albino rats.
12. A 14-day old worm.
13. A 20-day old worm showing an abnormally located testis(T).
14. A 50-day old worm.
15. A 88-day old worm showing no testis.
16. A 88-day old worm showing one testis.
17. A 88-day old worm showing two testes.
Table 1 Infection status of E. cinetorchis metacercariae in H. cantori, which were collected from Namyangju-gun, Gyeonggi-do in October, 1985
Table 2 Measurements of E. cinetorchis metacercariae* obtained from H. cantori
Table 3 Recovery rate of E. cinetorchis from experimentally infected rats and mice
Table 4 Measurements of E. cinetorchis recovered from experimentally infected rats and mice
Table 5 Newly appeared organs of E. cinetorchis according to the age of infection
Table 6 Number of testes by the age of E. cinetorchis
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