- an infectious disease characterized by high fever, pains in joints, bones, and muscles, and a cutaneous eruption, caused by rickettsii and transmitted by ticks: first reported in the Rocky Mountain area, but now more widely distributed.
- an acute rickettsial disease characterized by high fever, chills, pain in muscles and joints, skin rash, etc. It is caused by the bite of a tick infected with the microorganism Rickettsia rickettsii
- An acute infectious disease caused by Rickettsia rickettsii that is transmitted by ticks, characterized by muscular pain, high fever, and a skin rash, and is endemic throughout North America.
- An acute infection caused by the bacteria Rickettssia Rickettii and transmitted by ticks of the family Ixodidae. It is characterized by fever, extreme exhaustion, muscle pains, and skin rash.