The broad tapeworm story.
D000818:Animals; D000829:Animals, Domestic / Q000469:parasitology; D002589:Cestoda; D002590:Cestode Infections / Q000266:history* / Q000635:transmission; D003081:Cold Climate; D004170:Diphyllobothrium; D004197:Disease Reservoirs; D005387:Finland; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D012537:Scandinavian and Nordic Countries; D014586:USSR