EFFECTS OF THE HOST RESPONSE ON LONGEVITY OF HYMENOLEPIS NANA CYSTICERCCOIDS IN REINFECTED BEETLES

Abstract

Adult beetles, Tribolium confusum, were exposed to gravid proglottides of worms,Hymenolepis nana obtained from an already infected mice. Fourteen days after initialinfection the beetles were infected as before. Four days later they were dissected beforethe cysticercoids of the second infection were fully developed. The results revealed thatthe beetles can be infected more than once, and cysticercoids can live through the life ofthe beetles, there is no effective host resistance associated with a number of infections,nor is there effective interference with cysticercoids development.