Hoppe D M
J Wildl Dis. 1976 Jan;12(1):27-9. doi: 10.7589/0090-3558-12.1.27.
Hunter-killed ducks were examined in North Dakota from 1969 through 1972 for prevalence of macroscopically detectable cysts of Sarcocysitis. Fifty-seven of 632 (9%) adult dabbling ducks and 1 of 420 (0.24%) juveniles were infected. Sarcocystis was not detected in 169 adult and 91 juvenile diving ducks.