[Susceptibility of the Chinese hamster (Cricetulus griseus) to parasitic infection (3). Experimental infection with Hymenolepis nana or Trichuris muris to the cortisone treated Chinese hamster].

Susceptibility of Chinese hamster (Cricetulus griseus) of Asahikawa Colony (CHA) to Hymenolepis nana or Trichuris muris infection was compared in the feces-egg examination with that of mice as the control animals. Though CHA were resistant to the infection of H. nana, they were found to become susceptible to H. nana by the treatment with cortisone. A half number of CHA was infected with H. nana and the eggs were detected from each animal only in 4 or 6 days in the periods of examination more than 40 days. Mice with or without cortisone treatment were equally susceptible to H. nana infection. In another experiment, CHA with or without cortisone treatment were completely resistant to Trichuris muris infection. Mice, as the control animals, were found to be infected with T. muris in both of cortisone-treated and non-treated groups. Results from the fecal examination, it was confirmed that T. muris were expelled naturally from the animals on the weeks of 11 to 33 after infection.