Читать книгу Practical Guide to Diagnostic Parasitology - Lynne Shore Garcia - Страница 63

The adult form of the tapeworm is acquired through ingestion of the larval forms contained in poorly cooked or raw meats or freshwater fish (Taenia spp., Diphyllobothrium spp.). Dipylidium caninum infection is acquired by the accidental ingestion of dog fleas infected with the larval tapeworms. Both Hymenolepis nana and H. diminuta are transmitted via ingestion of certain infected arthropods (fleas and beetles). Also, H. nana can be transmitted through egg ingestion (its life cycle can bypass the intermediate beetle host). The adult tapeworm consists of a chain of egg-producing units called proglottids, which develop from the neck region of the attachment organ, the scolex. Food is absorbed through the worm’s integument. The intermediate host contains the larval forms, which are acquired through ingestion of the adult tapeworm eggs. Humans can serve as both the intermediate and definitive hosts in H. nana and Taenia solium infections.