A rickettsiosis is a disease caused by intracellular bacteria. It has been predicted that global warming may lead to greater incidence. ==Examples and causative organisms== Rickettsioses can be divided into a spotted fever group (SPG) and typhus group (TG). In the past, rickettsioses were considered to be caused by species of Rickettsia. However, ... Found on http://en.wikipedia.org/wiki/Rickettsiosis