Which of the following statements is true about endemic typhus:: (A) ls caused by R. rickettsii, (B) ls transmitted by bites of fleas, (C) Has no Mammalian reservoir, (D) Can be cultured in chemical defined culture medium
Answer is B. Option 1, 2, 3 Endemic typhus: Causative agent- R. typhi Vector - Flea, Rats are the reservoir Option 4 Rickettsiae cannot be cultivated in cell free media. Isolation can be done by cell lines (Vero, primary chick embryo, WI-38, HeLa), egg (yolk sac inoculation), or animal inoculation (guinea pig).