The lymphocytopaenia in tick-borne fever.
D000818:Animals; D008231:Lymphopenia / Q000097:blood* / Q000209:etiology / Q000662:veterinary; D012282:Rickettsia Infections / Q000097:blood / Q000150:complications* / Q000635:transmission / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000097:blood*; D013987:Ticks