**6.1.1 Penicillin**

Penicillin influences the gram-positive coccus, some gram-negative microorganisms and spirochetes. They are used in order to provide prophylaxis in streptococcus, pneumococcus, staphylococcus, salmonella, shigella infections, venereal diseases and also in rheumatic fever (Kavakl et al, 1998).
