For which condition is penicillin G typically NOT used?

Penicillin G is an antibiotic commonly used to treat various bacterial infections, but it is ineffective against viral infections. This is because antibiotics, including penicillin, specifically target bacterial processes and structures, such as cell wall synthesis, which do not exist in viruses. Viral infections are caused by pathogens that require a different approach to treatment, often involving antiviral medications, which target viral replication and lifecycle. Conditions listed like meningitis, neurosyphilis, and anthrax are all bacterial infections that penicillin G is effective against, making them inappropriate for this question. Thus, the key reason penicillin G is not used for viral infections is grounded in the fundamental differences between bacterial and viral pathogens and the specific action of antibiotics.