Studies on tickborne encephalites of sheep and their natural foci in Bulgaria.
D000818:Animals; D001179:Arthropod Vectors; D002031:Bulgaria; D004669:Encephalitis Viruses, Tick-Borne / Q000302:isolation & purification; D004675:Encephalitis, Tick-Borne / Q000453:epidemiology / Q000662:veterinary*; D051379:Mice; D012621:Seasons; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology*; D013987:Ticks