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Effects of snail size on encystment of Echinostoma caproni in juvenile Biomphalaria glabrata (NMRI strain) and observations on the survival of infected snails

  • J.L. Schneck (a1) and B. Fried (a1)

Abstract

The effects of snail size on encystment of Echinostoma caproni cercariae in neonatal and juvenile Biomphalaria glabrata (NMRI strain) snails were studied. Encystment in neonatal (0.7–1.1 mm shell diameter) and juvenile (2–3 mm shell diameter) snails was compared 24 h post-infection (PI) following individual exposure of snails of each size to 1, 5, 10, 25 and 50 cercariae. Significantly more cysts were recovered from juveniles exposed to 1, 5, 10 and 50 cercariae than from neonatals with comparable exposure. Size of B. glabrata was a major factor in determining cyst burden in this planorbid. Survival of infected versus uninfected neonatals and juveniles was also examined for 7 days. Neonatals exposed to 10 cercariae showed a significant decrease in survival at 3, 6 and 7 days PI when compared to the uninfected controls. There was no significant decrease in the survival of juveniles exposed to 10 cercariae compared to uninfected controls at any time point. Snail size was a factor in mortality associated with echinostome cercarial penetration and encystment.

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*Fax: (610) 330-5705 Email: friedb@lafayette.edu

References

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Frazer, B.A. & Fried, B. (1998) Single-species infections of Echinostoma caproni cercariae in pulmonate snails and concurrent infections of E. caproni and Echinostoma trivolvis cercariae in Biomphalaria glabrata. International Journal for Parasitology 28, 595597.
Fried, B. & Huffman, J.E. (1996) The biology of the intestinal trematode Echinostoma caproni. Advances in Parasitology 38, 311368.
Idris, N. & Fried, B. (1996) Developing, hatching, and infectivity of Echinostoma caproni (Trematoda) eggs, and histologic and histochemical observations on the miracidia. Parasitology Research 82, 136142.
Kuris, A.M. & Warren, J. (1980) Echinostome cercarial penetration and metacercarial encystment as mortality factors for a second intermediate host, Biomphalaria glabrata. Journal of Parasitology 66, 630635.
Sullivan, J.J. (1985) Juvenile snails as hosts for echinostome metacercariae. Southeast Asian Journal of Tropical Medicine and Public Health 16, 343344.
Ulmer, M.J. (1970) Notes on rearing of snails in the laboratory. pp. 143144in MacInnis, A.J. & Voge, M.(Eds) Experiments and techniques in parasitology. San Francisco, Freeman.

Effects of snail size on encystment of Echinostoma caproni in juvenile Biomphalaria glabrata (NMRI strain) and observations on the survival of infected snails

  • J.L. Schneck (a1) and B. Fried (a1)

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