In a recent paper1 the presence of plerocercoids of Diphyllobothrium latum was reported in the following four species of food fishes taken from Lake Superior and Portage Lake, in the Upper Peninsula of Michigan: Stizostedeon canadense-griseum De Kay, Stizostedeon vitreum Mitch., Esox lucius L., and Lota maculosa Le Sueur. Magath2 reported that he had raised D. latum from the plerocercoids taken from Esox lucius, Long Lake, Minn. Thus it has been proved that at least four species of food fishes serve as second intermediate hosts of D. latum. Essex3 raised coracidia from eggs collected from the stools of patients and with them he experimentally infected Cyclops brevispinosus, C. prasinus and Diaptomus oregonensis, thus demonstrating that all these native species of copepods are capable of serving as first intermediate hosts. Although he did not obtain any naturally infested copepods from the waters of the region in which he
VERGEER T. CANADIAN FISH, A SOURCE OF THE BROAD TAPEWORM OF MAN IN THE UNITED STATES. JAMA. 1928;90(21):1687–1688. doi:10.1001/jama.1928.02690480009003
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