Germ theory of disease

The germ theory of disease is the scientific idea that many diseases are caused by tiny organisms known as germs, which include bacteria, viruses, fungi, and parasites. These germs can enter the body and multiply, leading to illness. The theory fundamentally changed medicine by establishing that infections could spread through various means, such as direct contact, contaminated surfaces, or the air. This understanding has led to practices like sterilization, vaccination, and improved hygiene, significantly reducing the spread of diseases. Overall, it underlines the importance of identifying and controlling germs to protect public health.