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Infection

Infection occurs when harmful microorganisms, such as bacteria, viruses, fungi, or parasites, invade the body and multiply, leading to a host response and potential illness. Infections can range from mild, self-limiting conditions to severe and life-threatening diseases. Common types of infections include respiratory infections (such as the common cold or influenza), urinary tract infections, gastrointestinal infections, sexually transmitted infections, and skin infections. Symptoms of infection can vary depending on the specific pathogen and affected body system but may include fever, pain, inflammation, fatigue, and changes in bodily functions. Preventive measures such as practicing good hygiene, getting vaccinated, and avoiding exposure to infectious agents are important in reducing the risk of infection.