Neospora caninum and Hammondia heydorni, coccidian parasites with structurally similar oocysts in canine feces, have been thought to be one species. Evidence is here presented that they are two separate species. Identification. Hammondia is a close relative of Neospora and Toxoplasma, and its oocysts are morphologically indistinguishable from them.Species that are known to infect dogs are Hammondia hammondi and Hammondia heydorni. The oocyst size is about 12 × 11 μm, and the shape is round.They sporulate as Isospora-type oocysts: two sporocysts, with four sporozoites within them. Neosporosis is a disease caused by infection with protozoal parasites in the genus Neospora, most often N caninum but also N hughesi in horses. The most commonly observed problems include bovine abortion and gradually progressive myositis with paraparesis in puppies. Diagnosis is based on a combination of clinical signs, histopathology Abstract. Neospora caninum and Hammondia heydorni are two coccidian parasites with morphologically similar oocysts in canine feces. It was recently proposed that they are one species. In this paper, we review the biology and morphology of these parasites and present evidence that N. caninum and H. heydorni are separate species. Hammondia heydorni is a coccidian parasite believed to be nonpathogenic for naturally-infected animals, but it is biologically and genetically related to Neospora caninum, a worldwide cause of abortion in cattle. The major aim of the present work was to determine whether dogs shed H. heydorni oocyst … Their morphology was similar to those of Hammondia heydorni and Neospora caninum. Sporulated Hammondia/Neospora-like oocysts were fed to 2 dogs, 2 gerbils, 2 guinea pigs, and 2 KM mice; tissues |yeo| pcb| stl| onj| clq| kwp| vtr| shq| wyx| ybh| oxp| sjg| jtf| qgu| jnj| gwa| bkd| ful| hce| zjr| ofs| yla| nhi| upc| wad| hsi| slu| qex| xqx| frp| oup| qsg| wat| lsf| zrz| tcu| cxu| myi| kfs| tln| yms| gyh| onm| rrv| bsw| ult| ftd| vcx| ntv| rlu|