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The effects of crowding on adults of Echinostoma caproni in experimentally infected golden hamsters

Published online by Cambridge University Press:  05 June 2009

G. Yao ,
J. E. Huffman  and
B. Fried
G. Yao
Affiliation:
Department of Biological Sciences, East Stroudsburg University, East Stroudsburg, PA 18301, USA
J. E. Huffman*
Affiliation:
Department of Biological Sciences, East Stroudsburg University, East Stroudsburg, PA 18301, USA
B. Fried
Affiliation:
Department of Biology, Lafayette College, Easton, PA 18042, USA
*
1To whom correspondence should be sent.
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Abstract

Fifty-nine of 60 (98%), 6-month-old male golden hamsters, Mesocricetus auratus, fed 15 (group A). 50 (group B), or 200 (group C) metacercarial cysts of Echinostoma caproni (Digenea: Echinostomatidae) were infected 7–34 days postexposure. The mean number of worms recovered in groups A, B and C were 9, 10, and 50, respectively. The percentage recovery was significantly different between group A (63%) and groups B (21%) and C (23%). The intestine was divided into three equal regions (I, II, III). Worms from group A were located in segments II and III of the small intestine whereas worms from groups B and C were distributed in all three segments. The body area, ovarian and testicular areas of worms from group A were greatest, followed in decreasing order by body and gonadal areas of worms from groups B and C. Echinostoma caproni eggs were found in the faeces of all the hamsters examined from groups A, B and C by days 9, 10 and 11, respectively. Physical damage occurred at the site of attachment of the echinostome. Pathological observations indicated the presence of enlarged lymphatic nodules with lymphocytes being the primary cellular infiltrate at the site of parasite attachment.

Keywords

Echinostoma capronihamsterinfectivitygrowthdevelopmentpathologyTrematodaprepatency
Type
Research Papers
Information
Journal of Helminthology , Volume 65 , Issue 4 , December 1991 , pp. 248 - 254
Copyright
Copyright © Cambridge University Press 1991

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