Colorado tick fever presents in the Mountain West as a sudden biphasic fever with chills, headache, and myalgia, often mistaken for summer flu. Roughly half of patients experience a second fever spike a few days after the first appears to resolve - the saddleback fever curve is a useful clue.
Soft tick relapsing fever in the United States is largely a disease of mountain cabins above 3,000 feet in California, Nevada, Arizona,…
Colorado tick fever virus infects red blood cell precursors in the bone marrow and rides inside mature erythrocytes for the cell's full…
Dermacentor occidentalis transmits Rickettsia 364D (now classified as Rickettsia rickettsii subsp. californica), the cause of Pacific…
Rickettsia parkeri rickettsiosis, transmitted by the Gulf Coast tick, causes fever, headache, and a near-pathognomonic black eschar at the…
The hallmark spotted rash of Rocky Mountain spotted fever does not appear until day 2 to 5 of illness, and roughly 10 percent of cases…
Winter tick (Dermacentor albipictus) outbreaks are tightly coupled to short snow seasons. Late autumns let questing larvae find moose…