Rocky Mountain spotted fever is a tickborne disease first recognized in 1896 in the Snake River Valley of Idaho. It was originally called “black measles” because of the look of its rash in the late stages of the illness, when the skin turns black. It was a dreaded, often fatal disease, affecting hundreds of people in Idaho. By the early 1900s, the disease could be found in Washington, Montana, California, Arizona, and New Mexico.

Tickborne diseases are becoming a serious problem in this country as people increasingly build homes in formerly uninhabited wilderness areas where ticks and their animal hosts live. Tickborne diseases can be caused by viruses, bacteria, or parasites. Most people become infected through tick bites during the spring and summer months.

Because of the work started by Dr. Ricketts in the early 1900s, NIAID Rocky Mountain Laboratories (RML) remains a thriving center for infectious disease research on tickborne diseases, such as Lyme disease and relapsing fever. RML also continues to do research on rickettsial diseases.

The incidence of tickborne infections in the United States has risen significantly within the past decade. Due to this increase, it is becoming more important that public health officials and scientists improve their understanding of pathogenesis, design improved diagnostics, and develop preventive vaccines for tickborne illnesses.

Tickborne diseases are becoming a serious problem in this country as people increasingly build homes in formerly uninhabited wilderness areas where ticks and their animal hosts live. Tickborne diseases can be caused by viruses, bacteria, or parasites. Most people become infected through tick bites during the spring and summer months.

Scientists are searching for better ways to diagnose, treat, and prevent tickborne diseases. They are also looking for ways to control the tick populations that transmit microbes.