Tropical Medicine and Infectious Diseases

Rickettsiosis

Rickettsiae belong to the alpha-1 proteobacteria which are small gram-negative intracellular bacteria majorly transmitted by arthropods such as lice, fleas, ticks with two genera: Orientia with a unique specie and Rickettsia with several species. The clinical pictures which cause are known to be rickettsioses. All along the history, rickettsioses have been a threat and nowadays they are specifically cause of morbi-mortality in some areas of the world. Currently, ticks cause most travel-associated rickettsioses. Ticks are considered as one of the important vectors of infectious diseases in the world, preceded only by mosquitoes. Therefore, tick-borne rickettsioses are endemic all over the globe.