How can you prevent an infection naturally?

What is an infection, and what are its main forms?

An infection results from the invasion and multiplication of pathogens—viruses, bacteria, fungi, or parasites—in the body, triggering an immune response and clinical symptoms. It is the defining event of any infectious disease. Identifying the type of infection is essential before any treatment, as therapeutic strategies vary drastically depending on the causative agent. Immune-support supplements to help prevent infections are available in the “Immunity” and “Immune Defense” sections of the store.

The four main categories of infections are distinguished by their biology and treatment:

• Viral infections: caused by viruses (non-cellular entities that require a host cell to replicate)—the common cold, the flu, COVID-19, herpes, viral hepatitis—treated with targeted antivirals or by the immune system itself—antibiotics are completely ineffective against viruses—see viral infections
• Bacterial infections: caused by single-celled bacteria that reproduce independently—streptococcal throat infection, pneumonia, urinary tract infection, tuberculosis—treated with antibiotics based on an antibiotic susceptibility test—see guidelines for taking antibiotics
• Fungal infections (mycoses): athlete’s foot, candidiasis, onychomycosis, aspergillosis—treated with antifungals—more common in immunocompromised individuals
• Parasitic infections: malaria, giardiasis, pinworms, toxoplasmosis—treated with specific antiparasitic drugs following a parasitological diagnosis

What are the symptoms of an infection, and when should you seek emergency care?

General symptoms common to all infections include fever (a normal inflammatory response of the immune system), chills, severe fatigue, muscle pain (myalgia), and headaches. Localized signs indicate which organ is affected: cough and shortness of breath (respiratory infections), burning sensation when urinating (urinary tract infections), diarrhea and abdominal pain (gastrointestinal infections), redness, warmth, and pus on a wound (skin infections).

There are several situations that warrant calling 15 immediately: very high fever (> 40 °C) with altered consciousness, stiff neck, purpura fulminans (purplish spots that do not fade when pressed with a glass slide—meningococcal infection), severe breathing difficulties, extensive skin infection with fever and chills (erysipelas, cellulitis), or fever upon returning from a tropical country. For less urgent conditions that still require prompt medical attention, see the page on infectious conditions.

How can you prevent infections and naturally boost your immune system?

Infection prevention relies on barrier measures (washing hands with soap and water—the number one preventive measure, vaccination according to the immunization schedule, safe food handling—thoroughly cooking meat, washing fruits and vegetables) and on strengthening the immune system. Vitamin C (500–1,000 mg/day), vitamin D3 (1,000–2,000 IU/day—winter deficiency is very common), and zinc (10–15 mg/day) are the micronutrients best supported by EFSA evidence for normal immune system function.Echinacea (EMA: well-established use—a 2- to 4-week course before high-risk periods; contraindications: autoimmune diseases and immunosuppressants) complements phytotherapeutic support.

On antibiotic resistance—a global public health challenge: never use antibiotics without a doctor’s prescription; always complete the full course of treatment even if symptoms disappear earlier; never use antibiotics for a viral infection. See the infectious diseases page for a comprehensive approach to the diagnosis and treatment of infections.