PMID: 1202416Dec 1, 1975Paper

Some influences of population density on Hymenolepis diminuta in rats

Parasitology
C A Hesselberg, J Andreassen

Abstract

When measured 56 days postinfection the length, wet weight and dry weight of Hymenolepis diminuta were all found to decrease with increasing number of cysticercoids given up to 20. The mean position of the worms in 10, 12 and 20 worm infections is significantly posterior to that of 1, 2 and 5 worm infections and the worms are attached over a wider area of the intestine. Egg production by the worms was followed up to day 56 postinfection; the number of eggs produced per worm and even per rat decreased with increasing population density. Thus the best way to get most eggs and to maintain the parasite in the laboratory is to have rats infected with only one tapeworm. Rats given 1-20 cysticercoids showed a mean recovery of 100-65%, while rats given 40-200 cysticercoids showed a mean recovery ranging from 13 to 2%. In addition to 'normal' worms, defined as worms greater than 10 mm, small, most probably destrobilated, worms were found. In the 50 and 100 cysticercoid infections, worm recoveries were, respectively, 8% 'normal', 16% small, and 2% 'normal', 5% small. From the significantly lower recovery from heavy infections it is concluded that a deleterious factor is operating during the 8 weeks after the infection.

Citations

Oct 1, 1986·International Journal for Parasitology·J P ChristensenJ Andreassen
Nov 1, 1990·International Journal for Parasitology·J AndreassenD Befus
Feb 1, 1991·International Journal for Parasitology·C A Hopkins, J Andreassen
Dec 1, 1989·Parasitology·J Andreassen, D Hoole
Jun 1, 1982·International Journal for Parasitology·J AndreassenS Vienberg
Jan 1, 1984·Zeitschrift Für Parasitenkunde·B O Fagbemi, N O Christensen
Jun 1, 1994·Journal of Helminthology·J C Allan, P S Craig
Jan 21, 1980·Journal of Theoretical Biology·R M Anderson
Dec 1, 1983·International Journal for Parasitology·A KeymerA Singhvi
Jul 16, 2005·International Journal for Parasitology·B L Fredensborg, R Poulin
Oct 13, 2006·The Journal of Animal Ecology·Thomas S ChurcherMaría-Gloria Basáñez
Aug 22, 2018·International Journal of Molecular Sciences·Patrycja KapczukIrena Baranowska-Bosiacka

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