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What causes infections?

Infections are caused by an invasion of organisms into your body, which creates disease. Bacterial infections happen when bacteria enter your body and either produce a harming substance or attack your tissues. Viral infections happen when a virus is ingested, inhaled, or contracted through sexual activity. The virus invades your cells, takes control, and makes the cells reproduce the virus. Parasitic infections are the result of a parasite entering the body, and fungal infections usually happen after fungal spores are inhaled or land on the skin.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.