Disorders produced by organisms, such as bacteria, viruses, fungus, or parasites, are known as infectious diseases. Human bodies are home to various microbes and bacterias. In most cases, they are beneficial or even safe. But certain microbes have the potential to cause disease in specific situations. Some infectious diseases can transmit from one person to another and are considered contagious. Germs in the air, water, food, or soil can spread other infectious diseases. They can also spread by animals or vectors like biting insects.
