Original Article

Veterinary Research Communications

, Volume 36, Issue 1, pp 47-55

First online:

Experimental caprine coccidiosis caused by Eimeria arloingi: Morphopathologic and electron microscopic studies

  • Mohammad HashemniaAffiliated withDepartment of Pathobiology, School of Veterinary Medicine, University of Shiraz
  • , Azizollah Khodakaram-TaftiAffiliated withDepartment of Pathobiology, School of Veterinary Medicine, University of Shiraz Email author 
  • , Seyed Mostafa RazaviAffiliated withDepartment of Pathobiology, School of Veterinary Medicine, University of Shiraz
  • , Saeed NazifiAffiliated withDepartment of Clinical Studies, School of Veterinary Medicine, University of Shiraz

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The progressive morphohistopathologic changes, distribution pattern of lesions and ultrastructural characteristics in Eimeria arloingi infection were investigated in experimentally infected kids. The 18 newborn animals allocated to 3 equal groups. Two of groups, A, B were inoculated with a single dose of 1 × 103 and1 × 105 sporulated oocysts of E. arloingi, respectively. At 7, 14, 21, 28, 35, and 42 days postinoculation (DPI), 1 kid from each group was necropsied for pathologic and ultrastructural studies. Progressive lesions were present at 21, 28, 35 and 42 DPI in the jejunum, ileum, cecum with fewer in the duodenum and proximal colon. The oocysts shedding begin between 16 to 18 DPI. Grossly, minimal changes were observed at 21 DPI as few whitish plaques or nodules and advanced lesions at 42 DPI as pseudoadenomatous pattern in the mucosa and a cerebriform pattern on the serosal surface of jejunum and ileum. Early histopathologic lesions due to schizogony phase were including presence of intracytoplasmic developmental stages of the parasite such as trophozoites, immature to mature schizonts and mild infiltration of inflammatory cells. In late lesions due to various stages of gametogony, the histological pattern was mainly remarkable hyperplasia of the villi and crypts epithelial cells, eventually developed into papillary projections of reactive epithelium. The mesenteric lymph nodes showed a few numbers of large schizonts in the cortical lacteals. This study showed E. arloingi as a highly pathogenic species for kids, the incubation period was 16–18 days and the main target organ was jejunum with characteristic morphohistopathologic lesions.


Experimental infection Eimeria arloingi Morphopathologic lesions Coccidiosis Kids