Amblyomma maculatum was once confined to a coastal band along the Gulf of Mexico. Established populations now reach Connecticut and the lower Hudson Valley, carried north largely by migratory grassland birds. In some northern populations more than 20 percent of adults carry Rickettsia parkeri.
Amblyomma cajennense (sensu lato) - now recognized as a complex of six closely related species - is the principal Latin American vector of…
Amblyomma cajennense is cold-sensitive and active year-round in the Caribbean, Mexico, Central America, and lowland South America, but…
A single tick species, Amblyomma americanum, transmits ehrlichiosis from Ehrlichia chaffeensis and E. ewingii, tularemia, Heartland virus,…
Dermacentor variabilis adults have ornate white-and-brown mottling on the scutum and are roughly the size of a watermelon seed when unfed.…
Dermacentor occidentalis transmits Rickettsia 364D (now classified as Rickettsia rickettsii subsp. californica), the cause of Pacific…
Rhipicephalus sanguineus is a competent vector of Rickettsia rickettsii in the southwestern United States and northern Mexico, where…