The insect vector as transmitter of disease.
D000818:Animals; D001179:Arthropod Vectors; D002417:Cattle; D002418:Cattle Diseases / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D007303:Insect Vectors; D012373:Rocky Mountain Spotted Fever / Q000266:history*; D013987:Ticks; D014481:United States