Eimeria Innocua

Host: Turkey.

Moore and Brown (1952) were unable to infect the chicken, guinea fowl, ringnecked pheasant and bobwhite quail with E. innocua.

Location: Thruout the small intestine.

Geographic Distribution: North America (New York).

Prevalence: Apparently uncommon.

Morphology: The oocysts of this species were described by Moore and Brown (1952). They are subspherical, smooth, 19 to 26 by 17 to 25 u with a mean of 22 by 21 u, and without a micropyle or oocyst polar granule. No other morphological information was given. The sporulation time is 2 days.

Life Cycle: Unknown. The endogenous stages occur in the epithelial cells of the villi. The tips of the villi are most heavily parasitized, while the crypts and deep glands are never affected. According to Moore and Brown (1952), oocysts first appear in the feces 5 days after infection, and the patent period is up to 9 days.

Pathogenesis: This species is non-pathogenic according to Moore and Brown (1952). They observed no macroscopic lesions, even in heavy infections; poults less than 5 weeks old showed no signs of illness and had no diarrhea.

Immunity: Moore and Brown (1952) immunized turkey poults by infecting them with 4 to 7 doses of oocysts over a period of 22 to 29 days. The immunized birds were not immune to E. dispersa, the species which E. innocua most closely resembles, and turkeys immunized against E. dispersa were susceptible to infection with E. innocua.