The rarest and most unstudied type of the disease is endemic. It barely happens in the wealthy regions of the world. Usually, the carriers of these bacteria can be noticed in the places with a low level of hygiene. In addition, the environment must be cold to let the carriers live and reproduce. Many people know this disease more as the ‘jail fever’ as mostly prisoners suffer from this problem due to the poor hygiene and pretty low temperatures. Except for the tiny parasites, the rats and mice also may pass this sort of typhus to people.