Host: Domestic and wild pigs.
Location: Intestine. The sexual stages are found in the epithelial cells of the villi.
Geographic Distribution: Worldwide.
Prevalence: Yakimoff et al. (1936) found this species in 33% of 141 pigs in Russia.
Morphology: The oocysts are ovoid to ellipsoidal, 22 to 36 by 16 to 28 u. The oocyst wall is brown, rough, and 1.5 to 2.0 u thick, becoming thinner at the narrow end. A micropyle is present according to Pellerdy (1949), but was not mentioned by Henry (1931). An oocyst polar granule is present. There is no oocyst residuum. The sporocysts are ellipsoidal, 15 to 19 by 6 u, and have a sporocyst residuum. The sporulation time is 9 to 12 days.
Life Cycle: The endogenous stages of this species have not been described. Pellerdy (1949) found that the prepatent period in 2 experimentally infected pigs was 9 days.
Pathogenesis: Uncertain. Alicata and Willett (1946) found that pigs experimentally infected with 20 to 30 million mixed sporulated oocysts of E. debliecki and E. scabra developed a profuse diarrhea lasting 2 to 15 days, lost their appetites and did not gain weight. How much of this effect was due to E. scabra is not known.