Protective immunity to heartwater (Cowdria ruminantium infection) is acquired after vaccination with in vitro-attenuated rickettsiae.


A Senegalese (S) stock of Cowdria ruminantium was passaged on bovine umbilical endothelial cells with an average interval of 13.9 days (range, 8 to 34 days) between passages. The virulence of infected bovine umbilical endothelial cultures was tested in susceptible goats and sheep by intravenous inoculation of culture supernatant from passages 2 (51 days in… (More)

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