● LACKMAN DB,BELL EJ,STOENNER HG,PICKENS EG (1965). THE ROCKY MOUNTAIN SPOTTED FEVER GROUP OF RICKETTSIAS. Health Lab Sci2, 135-41. ● Fornadel CM,Zhang X,Smith JD,Paddock CD,Arias JR,Norris DE (2011). High rates of Rickettsia parkeri infection in Gulf Coast ticks (Amblyomma maculatum) and identification of "Candidatus Rickettsia andeanae" from Fairfax County, Virginia. Vector Borne Zoonotic Dis.11, 1535-9.