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Table 17-1

Rash morphologyDifferential diagnosisVectors (organisms)
Maculopapular

Human typhus

Rocky mountain spotted fever

Scrub typhus

Relapsing fever

Human louse (Rickettsia)

Ticks (Rickettsia)

Mites (Rickettsia)

Lice/ticks (Borrelia recurrentis)

VesicularRickettsial poxMouse/louse (Rickettsia)
AnnularLyme diseaseTick (B. burgdorferi)
Nodules (pruritic)OnchocerciasisBlackfly (Filaria, Onchocerca volvulus)
Nodules (ulcerating)LeishmaniasisSand fly (Leishmania)
Necrotic lesionsTick typhusTick (Rickettsia)
Facial flushingYellow fever/dengueAedes mosquito (Arbovirus)