Preservation of the infectious agent of tick-borne fever in the frozen state.
D000818:Animals; D001179:Arthropod Vectors; D005615:Freezing; D006168:Guinea Pigs; D012281:Rickettsia / Q000302:isolation & purification*; D012282:Rickettsia Infections; D012756:Sheep; D012757:Sheep Diseases / Q000382:microbiology*; D013987:Ticks; D014774:Virulence