Eimeria Canadensis

Synonyms: Eimeria zurnabadensis.

Hosts: Ox, zebu.

Location: Unknown. Oocysts found in feces.

Geographic Distribution: North America, USSR (Azerbaidzhan).

Prevalence: This species is quite common in the United States. Hasche and Todd (1959) found it in 35% of 355 cattle in Wisconsin.

Morphology: This species has been described by Christensen (1941). The oocysts are 28 to 37 by 20 to 27 u with a mean of 32.5 by 23.4 u. Their length-width ratio is 1.2 to 1.6 with a mean of 1.39. They are typically ellipsoidal, but vary from nearly cylindrical to stoutly ellipsoidal and occasionally slightly tapered. The oocyst wall is transparent, about 1 u thick in the middle, slightly thinner at each end, delicately yellowish brown (paler toward the ends), normally smooth, and apparently composed of a single layer lined by a membrane. The micropyle is an inconspicuous gap in the wall at one end, appearing covered with a thin, dark refraction line. An oocyst residuum and polar granule are absent. The sporocysts were not described by Christensen (1941). The sporulation time is 3 to 4 days.

Life Cycle: Unknown.

Pathogenesis: Apparently slight.