Development of Hammondia heydorni in Cultured Bovine and Ovine Cells1

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Abstract
Sporozoites were excysted from oocysts of Hammondia heydorni obtained from a naturally‐infected dog and inoculated into monolayer cultures of bovine pulmonary artery endothelial cells (CPA), Madin‐Darby bovine kidney (MDBK) cells, bovine monocytes (M617), or ovine monocytes (WOMO). Sporozoites penetrated all four cell lines and underwent asexual reproduction by endodyogeny (as determined by electron microscopy) to form cyst‐like structures at four to nine days after sporozoite inoculation (DAI). At 4–10 DAI, considerably more zoites were harvested from M617 cultures (80.1 times 106 zoites) than from CPA (17.4 times 106), MDBK. (47.3 times 106), and WOMO (53.5 times 106). Little or no parasite multiplication occurred at 10–16 DAI. Zoites harvested at 7 DAI and transferred to freshly prepared cultures did not penetrate cells nor develop further.