<prompt> All of the following are therapeutic uses of penicillin G, except -Bacterial meningitisRickettsial infectionSyphilisAnthrax  <response>: Ans. is b i.e., Rickettsial infection Antibacterial spectrum of Penicillin G Benzyl Penicillin o PnG is a narrow spectrum antibiotic o Activity is limited primary to gram positive bacteria and few others. o Amongst gram negative organisms, penicillin has activity against gonococci, meningococci, few Ecoli proteus. o Majority of gram negative bacilli are insensitive. o M. Tuberculosis, Ricketsiae, chlamydia, protozoa, fungi and viruses are totally insensitive to penicillin G. Penicillin G is the DOC for Laurence 9the 218. Katzun_g 7301 1. Meningococcal meningitis 7. Leptospira 2. Bacillus anthracis anthrax 8. Actinomyces israelii Actinomycosis 3. Clostridium perfringens gas gangrene 9. Borrelia burgdorferi Lyme disease 4. Clostridium tetani tetanus 10. Enterococci 5. Corynebacterium diphtheriae 11. Streptococci 6. Treponema pallidum syphilis 12. Susceptible pneumococci 