EFFECTS OF STRESS UPON ACQUIRED IMMUNITY TO DWARF TAPEWORM HYMENOLEPIS NANA

Severe and prolonged fighting among male mice hindered development of acquired immunity in stressed animals and increased the reinfection rate in mice with well-established acquired immunity. Stress induced by repeated association with strange mice also enhanced reinfection rates in immune mice. Severe nutritional stress rendered most immune mice susceptible to reinfection, but cold stress did not significantly increase reinfection rates.