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Release of Infectious Cells from Epidermal Ulcers in Ichthyophonus sp.–Infected Pacific Herring (Clupea pallasii): Evidence for Multiple Mechanisms of Transmission

Journal of Parasitology

By:
, ,
DOI: 10.1645/GE-2292.1

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Abstract

A common clinical sign of ichthyophoniasis in herring and trout is “sandpaper” skin, a roughening of the epidermis characterized by the appearance of small papules, followed by ulceration and sloughing of the epithelium; early investigators hypothesized that these ulcers might be a means of transmitting the parasite, Ichthyophonus sp., without the necessity of ingesting an infected host. We examined the cells associated with the epidermal lesions and confirmed that they were viable Ichthyophonus sp. cells that were readily released from the skin into the mucous layer and ultimately into the aquatic environment. The released cells were infectious when injected into the body cavity of specific-pathogen-free herring. Our hypothesis is that different mechanisms of transmission occur in carnivorous and planktivorous hosts: Planktonic feeders become infected by ingestion of ulcer-derived cells, while carnivores become infected by ingestion of whole infected fish.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Release of Infectious Cells from Epidermal Ulcers in Ichthyophonus sp.–Infected Pacific Herring (Clupea pallasii): Evidence for Multiple Mechanisms of Transmission
Series title:
Journal of Parasitology
DOI:
10.1645/GE-2292.1
Volume
96
Issue:
2
Year Published:
2010
Language:
English
Publisher:
BioOne
Publisher location:
Lawrence, KS
Contributing office(s):
Western Fisheries Research Center
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
348
Last page:
352
Number of Pages:
5
Country:
United States