| isolation of an agent of the spotted fever group rickettsia from tick eggs in madrid, spain. | ticks recovered from dogs in rural villages around madrid (spain) were processed to isolate rickettsiae. one sample containing mixtures of ticks and four containing eggs, in which rickettsiae had been detected by indirect immunofluorescence with a human serum highly reactive to rickettsia conorii, were decontaminated, homogenized and inoculated onto vero cells. two egg samples yielded a cytopathic agent that reacted positively by immunofluorescence. one sample (14h) was successfully subcultured ... | 1992 | 1601085 |