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Infection happens when harmful microorganisms invade the body and start to multiply. The primary causes of infection are: 1. Bacteria, which are the most common cause of many infections, including Helicobacter pylori infection that causes ulcers, usually spread through contaminated food, water, or poor hygiene. 2. Viruses, tiny germs that spread easily and cause diseases like COVID-19 and the Common Cold, usually transmitted through the air, direct contact, or bodily fluids. 3. Fungi, which can cause infections such as Candidiasis, often affecting the skin or genital areas. 4. Parasites, organisms that live inside the body and feed off it.