Why are antibiotics like metronidazole not effective for herpetic gingivostomatitis?

• A. The condition is caused by a virus, making antibiotics ineffective.
• B. Because the body already has enough antibiotics.
• C. Metronidazole is not absorbed in children.
• D. Antibiotics would prolong the illness.

Answer: (A)

Antibiotics don’t work on viruses. Herpetic gingivostomatitis is caused by the herpes simplex virus, so it’s a viral infection. Metronidazole targets bacteria by disrupting their DNA synthesis, and viruses don’t have the bacterial enzymes or metabolic pathways these drugs affect. Because the pathogen is a virus, the medication won’t impact the infection or its symptoms. Management is mainly supportive care, and antiviral therapy like acyclovir can be considered if started early. Antibiotics would only be relevant if a secondary bacterial infection is suspected, not to treat the viral illness itself.