If penicillin G is chosen as the best treatment for a given infection, what microorganisms are most likely the cause?

viruses

fungi

gram-positive bacteria

gram-negative bacteria

gram-positive bacteria

Explanation:

Based on the scenario being described within the question it can be said that the most likely cause would be gram-positive bacteria. This is because Gram-positive bacteria are bacteria that give a positive result within a Gram stain test, and are classified as being highly resistant to penicillin as well as an assortment of other antibiotics.