When we mention bacteria in the human body, you might immediately think of a disease, called a bacterial infection. At some point in your life, you have probably had an infection that was treated by antibiotics prescribed by your doctor. Antibiotics are medicines that kill or prevent the growth of bacteria.
However, the majority of the microbes are harmless and actually help to maintain our health. The microbes of the skin, mouth, and nose fight against bad bacteria that want to enter the body to cause disease. These good bacteria act like guards that keep away the harmful bacteria that make us sick. The bacteria that colonize the vagina are another example of good bacteria. They maintain an acidic environment in the vagina that prevents the growth of other microorganisms that might cause disease. Disease-causing microorganisms are called pathogens.
Even though most of the time they are harmless or even helpful, in certain conditions some of the bacteria that are part of the human microbiota can harm us.

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