Most gram-negative bacteria are resistant to the antibiotic, but some, such as the bacteria that cause gonorrhea, are susceptible, and others are responsive to high penicillin concentrations or to only certain classes of penicillins. Tuberculosis bacteria, protozoans, viruses, and most fungi are not affected by penicillin.
All penicillins act by interfering with synthesis of the cell wall.
Licensed from Columbia University Press. All rights reserved. Inc. All Rights Reserved.