Medical Definition of typhus
: any of various bacterial diseases caused by rickettsial bacteria: asa: a severe human febrile disease that is caused by one (Rickettsia prowazekii) transmitted especially by body lice and is marked by high fever, stupor alternating with delirium, intense headache, and a dark red rash—called also louse-borne typhusb: murine typhusc: scrub typhus
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