Rocky Mountain spotted fever vaccine

Rock·y Moun·tain spot·ted fe·ver vac·cine

suspension of inactivated Rickettsia rickettsii prepared by growing the rickettsiae in the embryonate yolk sac of fowl eggs.

Rocky Mountain spotted fever vaccine

An obsolete vaccine prepared from a sterile suspension of Rioccidianickettsii grown in embryonated chicken eggs; no vaccine is currently available for Rocky Mountain spotted fever.