The problem of relapsing fever in the Americas.
D001898:Borrelia / Q000302:isolation & purification; D004197:Disease Reservoirs; D006801:Humans; D007303:Insect Vectors; D009656:North America; D012061:Relapsing Fever / Q000175:diagnosis / Q000453:epidemiology* / Q000276:immunology / Q000382:microbiology; D013020:South America; D013987:Ticks