The word infection can denote any presence of a particular pathogen at all (no matter how little) but also is often used in a sense implying a clinically apparent infection (in other words, a case of infectious disease). An infection occurs when a microorganism — such as bacteria, fungi, or a virus — enters a person’s body and begins multiplying. What Is an Infection?

Understanding the Context

An infection is a condition caused by harmful microorganisms such as bacteria, viruses, fungi, or parasites invading the body. These pathogens disrupt normal bodily functions and can lead to a wide range of health problems. Symptoms of infectious diseases vary depending on the cause of the infection. But they often include fever and tiredness.

Key Insights

Rest and home remedies may clear up mild infections. But other infections can be life-threatening, and treatment could involve hospital care. If you have an ongoing infection, frequent follow-ups with your provider can help ensure your condition doesn’t worsen. You should also talk to your provider if you plan to travel outside of the country you live in. An infection is the invasion of the body by a disease-causing organism called a pathogen.

Final Thoughts

Infections can be caused by a wide range of pathogens, including bacteria, viruses, fungi, and parasites, and can develop in any organ system of the body. Infection is the process by which harmful microorganisms such as bacteria, viruses, fungi, or parasites enter cells and tissues in the body and cause disease. While most are mild and harmless, some staph infections can be dangerous. Here, doctors share the signs of a staph infection that require immediate treatment.