Rocky Mountain Spotted Fever is one of the deadliest tickborne diseases in the United States, often killing people within ...

Powassan encephalitis and Rocky Mountain spotted fever, two serious tick-borne diseases, have been identified in Minnesota residents, state health officials said today. More commonly occurring ...

Some cases are also reported from northern California, Oregon, and Washington, where it is spread by Ixodes pacificus ticks. Rocky Mountain Spotted Fever/ Rickettsia (RMSF) Rocky Mountain Spotted ...