What are the four different types of germs?

Infectious diseases are the single greatest cause of death worldwide.

Those diseases are caused by germs we share through everyday activities, according to the National Institutes of HealthOff Site Icon (NIH), such as:

  • Breathing
  • Drinking
  • Eating
  • Insect bites
  • Kissing
  • Sexual contact
  • Touching

The NIH says these four main kinds of germs are the cause of most infectious diseases:

  • Bacteria – These one-celled germs multiply quickly and can release chemicals that can make you sick
  • Fungi – These include plants, such as mildew and mushrooms
  • Protozoa – These one-celled animals use other living things as a source of food and living environment
  • Viruses – These are capsules that hold genetic material and use your own cells in order to multiply

Talk to your doctor to learn more about the four different types of germs.

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