In a windowless poultry house raising layer chickens in Kanagawa prefecture, Japan, a
slight increase in the mortality of chickens and a decrease in egg production were
observed. Necropsy revealed numerous tapeworms and proglottids in chicken intestines.
Histopathologically, gut-associated lymphoid tissues were observed in the lamina propria
of the jejunum; however, no significant changes were observed in the other organs.
Numerous hide beetles,
Dermestes maculatus
DeGeer, intermediate hosts of
Raillietina cesticillus
, were observed in the poultry house. Following
a decline in beetle numbers, egg production increased and chicken mortality decreased. The
life cycle of a tapeworm was easily established in a closed space, such as a windowless
house, which led to severe infections.