Definitive Hosts
Definitive hosts include fish-eating birds and mammals. The most common definitive hosts are the domestic dog, cat, and red fox. Humans are also definitive hosts for N. salmincola. A long list of experimental definitive hosts include the hamster and wood rat. Interestingly, an experimental study failed to infect two white rats and two white mice. Trematodes exist along the whole length of the small intestine in smaller animals like hamsters, while they exist only in the upper end of the small intestine in larger animals like dogs.
Read more about this topic: Nanophyetus Salmincola
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