Browsing by Author "Hildreth, M. B."

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    Descriptions of two new species of coccidia (Protozoa : Eimeriidae) and redescriptions of Eimeria ivensae and Eimeria odocoilei from captive white-tailed deer, Odocoileus virginianus
    Lindsay, David S.; Upton, S. J.; Hildreth, M. B. (American Society of Parasitology, 1999-12)
    Two new species of Eimeria were observed in the feces of captive white-tailed deer fawns, Odocoileus virginianus, from Alabama. The first new species was easily recognized because of its small size. Sporulated oocysts are spherical, average 10.2 by 10.0 mu m, and lack a micropyle and oocyst residuum. Oocysts contain a polar granule and elongare-ellipsoidal sporocysts that measure 6.7 by 3.1 mu m. A Stieda body is present on the sporocysts. Oocysts were observed in the feces, and gamonts and oocysts were observed in the jejunum of a month-old fawn from Minnesota that died from enteritis due to this species. Oocysts of this small species were present in 5 of the 6 white-tailed deer fawns examined. Oocysts of a second new species are ellipsoidal and average 29.5 by 24.6 mu m. The oocyst encloses an oocyst residuum, polar granule, and elongate-ellipsoidal sporocysts that average 16.0 by 9.0 mu m. A Stieda body and substieda body are present an the sporocysts. Oocysts of the second new species were present in 4 of the 6 white-tailed deer fawns examined. Oocysts of E. ivensae are ovoid or flask-like and average 32.0 by 20.8 mu m The oocyst wall is rough, contains a micropyle, and encloses elongate-ellipsoidal sporocysts that average 16.5 by 7.8 8.8 mu m A Stieda body is present on the sporocysts. Oocysts of E. ivensae were present in 4 of the 6 white-tailed deer fawns. Oocysts of E. odocoilei are spherical or slightly subspherical and measure 24.7 by 21.5 mu m. They enclose ovoid sporocysts that average 12.7 by 8.8 mu m. A Stieda and substieda body are present on the sporocyst. Oocysts of E. odocoilei were present in 4 of the 6 white-tailed deer fawns.
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    Porcine enteritis associated with Eimeria spinosa Henry, 1931 infection
    Lindsay, David S.; Neiger, R.; Hildreth, M. B. (American Society of Parasitology, 2002-12)
    Coccidia of the genus Eimeria arc present in roost pigs raised on dirt in the United States. They are generally considered nonpathogenic in weaned pigs. Oocysts of Eimeria spinoso Henry. 1931 were observed in tissue sections and intestinal contents of a weaned male pig that died Suddenly on a farm in Iowa. Microscopically, necrotizing enteritis associated with many thick-walled coccidial oocysts was present in intestinal sections. Examination of intestinal contents demonstrated oocysts that were thick-wallcd and had small projections on the surface of the oocyst wall, characteristic of E. spinosel Henry, 1931 of swine. Twenty-five oocysts in intestinal contents measured 20.4 by 14.2 mum. No pathogenic bacteria were detected in the pig by culture methods. but lesions suggestive of salmonellosis were observed in some tissues. The specific cause of death was not determined however, E. spinosa infection was considered to have contributed to the death of this pig. The results suggest that E. spinosa may be pathogenic for pigs.