A viral infection results from a virus entering and replicating within the body’s cells. Unlike bacteria—single-celled organisms capable of reproducing on their own—viruses are acellular entities that can only replicate by hijacking the reproductive machinery of a living host cell. This fundamental difference explains why antibiotics are completely ineffective against viral infections and should never be used to treat them. Antiviral immune-support supplements are available in the immunity and immune defense sections of the store.
Clinically, a viral infection differs from a bacterial infection in its often gradual onset, the presence of an initial flu-like syndrome (muscle aches, fatigue, moderate fever), a blood count showing lymphocytosis (rather than the neutrophilic polycytoosis seen in bacterial infections), and a CRP level that is often moderately elevated. Most common viral infections resolve spontaneously thanks to the immune system, without requiring specific antiviral treatment. See the pages on infections and infectious diseases for an overview.
The most common viral infections in general practice are:
Airborne transmission (respiratory droplets, aerosols) is the primary route of transmission for respiratory viruses. Handwashing remains the most effective preventive measure, supplemented by vaccination for viruses for which a vaccine is available.
Most common viral infections do not require specific antiviral treatment and resolve on their own through the immune system within 7 to 14 days. Rest, hydration (1.5 to 2 L/day), a light diet, and fever management (never treat a fever below 38.5 °C, as it helps fight the virus) form the foundation of care. Several natural supplements support the nonspecific antiviral response: vitamin C (500–1,000 mg/day—stimulates antiviral interferons), vitamin D3 (1,000–2,000 IU/day—reduces the frequency and severity of viral respiratory infections), zinc (directly inhibits the replication of several RNA viruses—10–15 mg/day),echinacea (EMA: well-established use—2 to 4 weeks, Contraindications: autoimmune diseases and immunosuppressive medications), and ravintsara (essential oil containing cineole—immunomodulatory and antiviral—diffusion or diluted for massage; contraindications: pregnancy and children under 6 years of age). Probiotics support the intestinal mucosal immune system, particularly after antibiotic therapy. Consult a doctor if a fever > 39 °C persists for more than 48 hours, if there are breathing difficulties, or if there are signs of worsening condition—see viral infections.
