It seems impossible that people once believed that foul odors could create disease or that “evil spirits” could cause a person to become ill. ..

They live in water, soil, and in the air. The human body is home to millions of these microbes too, also called microorganisms Some microbes make us sick, others are important for our health. The most common types are bacteria, viruses and fungi. There are also microbes called protozoa. These are tiny living things that are responsible for diseases such as toxoplasmosis and malaria.