title: The infectivity of a strain of Rickettsia ruminantium maintained in--70 degrees C deep freezer and white mice.
mesh_terms: D000818:Animals; D005615:Freezing; D006357:Heartwater Disease / Q000382:microbiology*; D051379:Mice / Q000382:microbiology*; D012281:Rickettsia / Q000472:pathogenicity*