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

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...

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Bibliographic Details
Published in:Journal of helminthology 1991-12, Vol.65 (4), p.248-254
Main Authors: Yao, G., Huffman, J. E., Fried, B.
Format: Article
Language:English
Subjects:
Animals
biological development
Cricetinae
crowding
development
Echinostoma - anatomy & histology
Echinostoma - growth & development
Echinostoma caproni
Echinostoma revolutum
Echinostomiasis - parasitology
experimental infection
Feces - parasitology
golden hamsters
growth
hamster
infectivity
Intestinal Diseases, Parasitic - pathology
Intestine, Small - parasitology
Male
Mesocricetus
Parasite Egg Count
pathogenicity
pathological processes and conditions
pathology
prepatency
Research Papers
Trematoda
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Summary: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.
ISSN:0022-149X
1475-2697
DOI:10.1017/S0022149X00010816