Abstract
DURING the summer of 1948 at the University of Michigan Biological Station, opportunity was afforded to determine the prevalence of Leucocytozoon simondi infections among domestic ducks in Emmet and Cheboygan Counties. The question was of particular interest since no information has been made available in the literature regarding the incidence of the disease in the endemic area of northern Michigan since O’Roke’s observations were published almost 20 years ago. (O’Roke, 1930, 1934).For the summer of 1930, O’Roke reported that 74 percent of all flocks examined in the general vicinity of the Biological Station were positive, and that of 200 individuals sampled, 35 percent were infected. During 1931 he found that 60 percent of all flocks (a total of 300 ducks) harbored infected individuals. Morbidity was found to be high among all age groups, with a very high mortality rate among the young ducklings. Ducklings exposed experimentally to blackfly bites .
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