an acute, infectious, and sometimes fatal tick-borne disease caused by Rickettsia rickettsii; characterized by fever, bone and muscle pain, headache, and rash. The disease occurs only in North and South America(Morris 1992).
Rocky Mountain spotted fever is the most severe and most frequently reported rickettsial illness in the United States, and has been diagnosed throughout the Americas. Some synonyms for Rocky Mountain spotted fever in other countries include â€œtick typhus,â€ â€œTobia feverâ€ (Colombia), â€œSÃ£o Paulo feverâ€ or â€œfebre maculosaâ€ (Brazil), and â€œfiebre manchadaâ€ (Mexico). The disease is caused by Rickettsia rickettsii, a species of bacteria that is spread to humans by hard ticks (Ixodidae).