Mr. X complained of chills and fever following a louse bite. He had rashes all over the body and was delirious at the time of presentation to the hospital and subsequently went into the coma. A provisional diagnosis of vasculitis due to rickettsial infection was made. Which one of the following can be the causative agent?
Rickettsia typhi Rickettsia rickettsiae Rickettsia prowazekii Rickettsia akarai