The source of typhus is perfectly known and was well-studied – tiny nasty bugs defined as a parasite. Those are lice, mites, and fleas infected with Rickettsia bacteria. Thus, the tick, for instance, also has to have these bacteria to transfer it to a human body. Unlike some other infectious illnesses, this disease is not passed from one individual to another. Typhus can be divided into 3 various categories. Every type of this disease has its own sources and consequences. The treatment also may vary a bit. Arthropods deliver the infectious bacteria into the human organism once they get to the bloodstream.