<Originals>Differences in the Infectivity and Longevity of Hymenolepis nana in Male and Female Mice

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The groups of male and female ddY mice at 5 weeks old were orally administered with 100 Hymenolepis nana eggs. Four days after infection and at weekly intervals thereafter for 7 weeks, 8 mice in each group were sacrificed, and differences in the infection rate, number of cysticercoid larvae in the intestinal villi (at the 4th day), number of adult worms in the intestinal lumen (at 14th day and thereafter), mean wet weight of adult worms, mean number of eggs per worm and number of eggs per 1 mg of feces (EPG) were compared between male and female mice. Analyses showed that there was no sex-related difference in all the parameters determined at the 4th and 14th day of infection. The infection rate was gradually decreased thereafter in female mice and only 12.5% of females were infected at the 49th day of infection, while more than half of the male mice were still infected at this time. The decrease in number of adult worms became apparent 3 weeks after infection in both sexes of mice and was more prompted in females than males. There was no apparent sex-related difference in the mean wet weight of adult worms and mean number of eggs per worm though statistically significant differences were observed at the 49th day of infection. EPG was always lower in females than males throughout the course of the experiment. These results indicate that, although infectivity and maturation of H. nana have not been affected, adverse effects on the longevity of adult worms and probably on the degree of oviposition have been more pronounced in females than males.
近畿大学の論文
1983-12-28

<Originals>Differences in the Infectivity and Longevity of Hymenolepis nana in Male and Female Mice

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