Microbiology General 1ae06987 About rickettsiae, all are true except - A These are transmitted by ahropod vectors B Eschar is not seen in RMSF C Weil-Felix reaction may be diagnostic D Cephalosporins are drugs of choice High-Yield Explanation Ans. is 'd' i.e., Cephalosporins are drugs of choice . Tetracyclines (e.g., doxycycline are DOCs).