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Isospora hammondi : ウィキペディア英語版
Isospora hammondi
:''This article is about ''Isospora hammondi'' Barnard et al., 1971, infecting rice rats. See ''Isospora datusi'' for the species sometimes known as ''Isospora hammondi'' (Frenkel, 1974).〔Tadros and Laarman, 1982, p. 332〕''
''Isospora hammondi'' is an apicomplexan parasite of the genus ''Isospora'' that infects the marsh rice rat (''Oryzomys palustris''). It was discovered at Tuskegee National Forest, Macon County, Alabama, and formally described in 1971.〔Barnard et al., 1971, p. 1293〕 The specific name honors Dr. Datus M. Hammond of Utah State University.〔Barnard et al., 1971, p. 1294〕
The oocyst is about egg-shaped and has a smooth, single-layered wall about 1 μm thick. It is 24 to 30 μm long and 16 to 21 μm broad when sporulated. There are two sporocyst, 13 to 18 μm long and 11 to 15 μm broad, with four sporozoites each. The sporozoites are placed parallel along the long axis of the sporocyst. The sporozoites are slightly curved in form and sausage-shaped and lack refractile globules. Near one end, there is one a light, rounded nuclear region.〔 Unlike most rodent-infecting ''Isospora'' species, ''I. hammondi'' lacks both an oocyst residuum and Stieda bodies. Most other species that also lack both of these structures have a differently shaped oocyst. Two other species—''Isospora uralica'' from the field mouse ''Apodemus sylvaticus'' and ''Isospora ordubadica'' from the gerbil ''Meriones persicus''—differ in size and other details.〔Barnard et al., 1971, p. 1295〕
In Alabama, ''I. hammondi'' was recovered in 3 of 19 examined marsh rice rats. At room temperature, it takes one and a half day for the oocysts to sporulate. The oocysts were found in the small and large intestines; the normal location in the host is unknown.〔 In four marsh rice rats inoculated with ''I. hammondi'', oocysts began to be passed on the sixth or seventh day and went on passing them for three or four days.〔Barnard et al., 1971, pp. 1293, 1295〕
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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