Order Rickettsiales is a taxonomic group of gram-negative bacteria that are typically parasitic or pathogenic in nature. Synonyms for Order Rickettsiales include the families Rickettsiaceae, Midichloriaceae, Anaplasmataceae, Wolbachieae, and Ehrlichiaceae. These families contain a diverse range of organisms that can cause diseases such as typhus, Rocky Mountain spotted fever, anaplasmosis, and ehrlichiosis. The identification of these organisms is important for their proper diagnosis and treatment, as well as for the prevention of their spread. The study of these bacteria is also important for understanding the ecology of disease transmission and the evolution of bacterial pathogens.