Answer
Acyclovir, the first successful antiviral drug, was developed by Gertrude Elion. It revolutionized the treatment of herpes infections, including herpes simplex virus (HSV) and varicella-zoster virus (VZV). Acyclovir works by inhibiting viral DNA polymerase, preventing the virus from replicating and spreading. Its discovery marked a significant milestone in antiviral therapy, providing a safe and effective treatment option for millions of people worldwide.