Exam I - Nanophyetus salmincola

Question 1

What is the common name for Nanophyetus salmincola?

Answer 1

Salmon poisoning fluke

Question 2

What is/are the final host(s) for Nanophyetus salmincola?

Answer 2

dogs, cats, minks, racoons, skinks, coyotes, & other fish-eating mammals

Question 3

What is/are the intermediate host(s) for Nanophyetus salmincola?

Answer 3

snails and fish

Question 4

Describe the appearance of Nanophyetus salmincola adults

Answer 4

Adults ovoid and creamy white, up to 2 mm.

Question 5

Describe the appearance of Nanophyetus salmincola egg

Answer 5

Eggs are oval, yellowish-brown, thick shell, 80 um

Question 6

What is the site of infection for Nanophyetus salmincola?

Answer 6

Adults in small intestine

Question 7

Describe the pathogenesis associated with Nanophyetus salmincola

Answer 7

Extremely pathogenic. Flukes are vectors of Neorickettsia helminthoeca which causes salmon poisoning in dogs (severe hemorrhagic enteritis)

Question 8

Describe the life cycle of Nanophyetus salmincola

Answer 8

• Final host passes eggs in feces, which hatch in streams.
• Miracidia emerge and penetrate the snail.
• Cercariae emerge from the snail to penetrate a fish to form metacercariae in various tissues (primarily kidneys, muscles, fins) and live up to 5 years.
• When a dog or cat ingest the intermediate host, the juvenile fluke excysts and matures in the small intestine

Question 9

What is/are the site(s) of infection for Nanophyetus salmincola?

Answer 9

Adults in small intestine

Question 10

Describe some clinical signs associated with Nanophyetus salmincola

Answer 10

A large number of flukes may cause diarrhea.

Salmon poisoning disease causes hemorrhagic enteritis, lymph node enlargement, sudden onset of fever, vomition, diarrhea, weigh loss, and high mortality