What is the main characteristic of Bacitracin?

Bacitracin is primarily characterized by its narrow antibacterial spectrum, specifically targeting Gram-positive bacteria. It is a peptide antibiotic that is effective against certain strains of Staphylococcus and Streptococcus species but does not have activity against a broad variety of microorganisms. This agent is commonly used topically due to its effectiveness against skin infections caused by these bacteria while minimizing the risk of resistance.

The other options do not accurately describe Bacitracin's profile. For instance, stating that it is a broad-spectrum antibacterial agent is not accurate, as Bacitracin's effectiveness is limited compared to truly broad-spectrum antibiotics. Bacitracin is not utilized for viral infections at all, and it does not exert any antifungal properties, which means it is indeed ineffective against fungi. Thus, understanding Bacitracin’s specific application and limitations in medicine is vital for effective use in clinical settings.