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"Small wriggling tapeworm segments work their way out of your cat or dog’s anus, leaving egg packets in your bed. While all of this might sound dramatic, it can and does happen," says Dr. MacMillan.

I beg to remark that I both figured and described this supplementary sucker-like structure in the first edition of my small work on “Tapeworms,” published in 1866 (p. 33 et seq.).

A fish tapeworm infection, or diphyllobothriasis, occurs when a person eats raw or undercooked fish that's contaminated with the parasite Diphyllobothrium latum. Find out more about it here.