V. Relapsing Fever - Borrelia species, transmitted by soft ticks from rodents to humans. High fever, jaundice, rash. A. Borrelia burgdorferi. The mice are not affected. Then the adult tick normally feeds on deer.
First symptom is usually a red rash at the site of the bite.
Bulls-eye appearance as center clears. Fig 23.15 Flulike symptoms follow. Typhus - caused by rickettsiae, spread by arthropod vectors, infect vascular endothelium and causes inflammation and blockage of capillaries. A. Epidemic typhus - Rickettsia prowazekii, carried by human body louse. Pathogen grows in GI tract of the louse and is excreted.