Eimeria Hagani

Host: Chicken.

Location: Anterior half of small intestine.

Geographic Distribution: North America, India.

Prevalence: Rare. This species has apparently been reported in the United States only by P. P. Levine (1938) in New York and Edgar (1955) in Alabama. Gill (1954a) found it in 2.5% of 120 chickens in India.

Morphology: The oocysts are broadly ovoid, smooth, 16 to 21 by 14 to 19 u with a mean of 19 by 18 u (18 by 16.5 u according to Edgar, 1955). A micropyle is apparently absent. An oocyst polar granule is present. No other morphological data are known; this species was differentiated from other chicken coccidia by cross-immunity tests. The sporulation time is 1 to 2 days. Edgar (1955) found sporulated oocysts as early as 18 hours at 29° C.

Life Cycle: Unknown. The prepatent period is 7 days according to Levine (1938) or almost 6 days according to Edgar (1955).

Pathogenesis: This species is only slightly pathogenic. Levine (1938) observed pin-head size hemorrhages and catarrhal inflammation in the anterior half of the small intestine. There were also a few hemorrhages in the lower small intestine. Later, however, Levine (1942a) referred to this species as non-pathogenic, stating that 300,000 oocysts had no effect on experimentally infected birds.