In this article we will discuss about Rickettsiae:- 1. Cultivation of Rickettsiae 2. Animal Inoculation of Rickettsiae 3. Laboratory Diagnosis 4. Resistance. Cultivation of Rickettsiae: All rickettsiae cannot be grown on cell free media, except R. Quintana which will grow on blood agar medium. They can be cultivated in yolk sac of chick embryo, grow […]