blue fever


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Related to blue fever: red fever

Rock·y Moun·tain spot·ted fe·ver

an acute infectious disease of high mortality, characterized by frontal and occipital headache, intense lumbar pain, malaise, a moderately high continuous fever, and a rash on wrists, palms, ankles, and soles from the second to the fifth day, later spreading to all parts of the body; it occurs in the spring of the year primarily in the southeastern U.S. and the Rocky Mountain region, although it is also endemic elsewhere in the U.S., in parts of Canada, in Mexico, and in South America; the pathogenic organism is Rickettsia rickettsii, transmitted by two or more tick species of the genus Dermacentor; in the U.S. it is spread by D. andersoni in the western states and D. variabilis (a dog tick) in the eastern states.

blue fever

Usage notes: (informal)
Rocky Mountain spotted fever, so named for the dark cyanotic discoloration of the skin after the initial rickettsial infection. The disease is characterized by headache, chills, and fever, as well as a rash. See also rickettsiosis, Rocky Mountain spotted fever, typhus.
Rocky Mountain spotted fever, an acute tick-borne illness caused by Rickettsia rickettsii