Epizootic of coccidiosis in free-flying lesser scaup (Aythya affinis)

Avian Diseases
By: , and 



A coccidiosis epizootic has occurred in lesser scaup (Aythya affinis) at Bluestem Reservoir in eastern Nebraska during the spring in each of three recent years: 1976-1978. Losses peaked during the period from mid-March through April. As much as 29% of the peak population of scaup using the reservoir died. Necropsies of 72 of the nearly 1390 scaup that died revealed destruction and sloughing of the intestinal mucosa and associated hemorrhaging. Fibrinonecrotic cores were frequently found in the intestinal lumens. Scrapings from the intestinal mucosal contained massive numbers of oocysts of the coccidian Eimeria aythyae. This is the first report of recurrent epizootics of coccidiosis in freeflying waterfowl.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Epizootic of coccidiosis in free-flying lesser scaup (Aythya affinis)
Series title Avian Diseases
DOI 10.2307/1589981
Volume 24
Issue 4
Year Published 1980
Language English
Publisher American Association of Avian Pathologists
Contributing office(s) National Wildlife Health Center
Description 6 p.
First page 1044
Last page 1049
Country United States
State Nebraska
Other Geospatial Bluestem reservoir
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
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