Viral Infections: Treatment vs. Cure—Why Antivirals Suppress, Not Eradicate

Unlike bacteria, **viruses cannot be “cured” in the traditional sense**—they are not alive outside host cells and lack independent metabolism to target.

Why No “Cure”?

• Viruses integrate into host machinery; eliminating them without harming host cells is extremely difficult.
• Latent/reservoir states (herpes, HIV, HBV) persist despite therapy.
• High mutation rates → rapid resistance.

What Antivirals Do

• Suppress replication: Polymerase inhibitors (acyclovir, tenofovir), protease inhibitors (HIV/HCV), neuraminidase inhibitors (oseltamivir).
• Reduce viral load: Allows immune system to control infection.
• Shorten duration/severity: If started early (e.g., influenza, herpes).
• Prevent transmission: HIV PrEP/ART, HSV suppressive therapy.

Curative Exceptions

• HCV: Direct‑acting antivirals (DAAs) achieve **sustained virologic response (SVR) = cure** in >95% (virus eradicated).
• HBV: Functional cure (HBsAg loss) rare; usually lifelong suppression.

Supportive Care

• Symptom management (fever, pain, hydration).
• Vaccines (prevent infection, not treat).
• Monoclonal antibodies (COVID‑19, RSV) – early treatment.

“Cure” implies pathogen elimination; for most viruses, **control** is the realistic goal. Research continues on CRISPR, therapeutic vaccines, and latency‑reversing agents.