<prompt> Epidemic typhus cause and vector isR. prowazki and louseR. typhi and miteR. conori and tickR. akari and mite  <response>: Epidemic Typhus Is a type of rickettsial disease of typhus group : Recrudence form of Epidemic typhus : Brill Zinsser Disease Was the most formidable rickettsial disease in past Causative agent: R.prowazekii Vector : Louse p.capitis,p.corporis Mode of Transmission: Not by Louse bite Scratching and inoculation with infected louse faeces Crushing infected louse on body Inhalation of infected louse faeces or dust Clinical picture : Prolonged febrile illness, Vasculitis Drug of choice : Tetracycline Under International Health Regulations IHRs, Louse borne typhus is a disease under surveillance Ref: Park 25th edition Pgno : 316 