Prevalence
Field surveys of wild mammal populations have shown wide variation in the percentage of animals infested with E. schneideri. Surveys of all hosts in the southeastern United States generally indicate infection rates in the range of 2-15%. Prevalence rates as high as 50% in mule deer near Durango, Colorado; 78% in black tailed deer herd in Mendocino County, California, 90% in mule deer herds at high elevation sites in Arizona and New Mexico, and 100% (14 of 14 animals) in Texas mule deer have been reported. In areas of high abundance in definitive hosts, the fear of spread to commercial livestock is greatest.
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