Rickettsia-parkeri
Guides
Amblyomma triste
Amblyomma triste is a hard tick species first described by Koch in 1844. It is the primary vector of Rickettsia parkeri, the causative agent of a spotted fever group rickettsiosis with symptoms resembling Rocky Mountain spotted fever. The species is the sole tick responsible for human tick-borne disease in Uruguay and a significant vector in Argentina and Brazil. Though historically considered restricted to South America, specimens have been documented in the United States (Arizona and Texas) and Mexico, where they were long misidentified as the morphologically similar Amblyomma maculatum.