question: Risk of transmission can be determined by a patient complaining of chills and fever following a louse bite 1/2 weeks before. He had rashes all over the body and was delirious at the time of presentation to the hospital and subsequently went into coma. A provisional diagnosis of vasculitis due to rickettsial infection was made. Which one of the following can be causative agent?
opa: Rickettsia typhi
opb: Rickettsia rickettsiae
opc: Rickettsia prowazekii
opd: Rickettsia akarai