title: Development of Hammondia heydorni in cultured bovine and ovine cells.
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 x 10(6) zoites) than from CPA (17.4 x 10(6], MDBK (47.3 x 10(6], and WOMO (53.5 x 10(6]. 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.
authors.affiliation: Veterinary Research Laboratory, Montana State University, Bozeman 59717.
authors.forename: C A
authors.initials: CA
authors.lastname: Speer
authors.forename: J P
authors.initials: JP
authors.lastname: Dubey
authors.forename: J A
authors.initials: JA
authors.lastname: Blixt
authors.forename: B
authors.initials: B
authors.lastname: Blagburn
mesh_terms: D000818:Animals; D002417:Cattle; D002460:Cell Line; D003044:Coccidia / Q000254:growth & development* / Q000648:ultrastructure; D008854:Microscopy, Electron; D012756:Sheep