DNA Base Composition of Rickettsiae

Abstract
There is a small but distinct difference in DNA base composition between the typhus and spotted fever groups of rickettsiae. The molar percentages of guanine plus cytosine for Rickettsia prowazeki , R. typhi , and R. canada are approximately 30, for R. rickettsi , R. conori , and R. akari they are about 32.5. The percentage for trench fever rickettsia, Rochalimaea quintana , is 38.6.