URL of this page: https://www.nlm.nih.gov/medlineplus/infectiousdiseases.html

Infectious Diseases

Also called: Communicable diseases 
On this page

See, Play and Learn

  • No links available


For You


Infectious diseases kill more people worldwide than any other single cause. Infectious diseases are caused by germs. Germs are tiny living things that are found everywhere - in air, soil and water. You can get infected by touching, eating, drinking or breathing something that contains a germ. Germs can also spread through animal and insect bites, kissing and sexual contact. Vaccines, proper hand washing and medicines can help prevent infections.

There are four main kinds of germs:

  • Bacteria - one-celled germs that multiply quickly and may release chemicals which can make you sick
  • Viruses - capsules that contain genetic material, and use your own cells to multiply
  • Fungi - primitive plants, like mushrooms or mildew
  • Protozoa - one-celled animals that use other living things for food and a place to live

NIH: National Institute of Allergy and Infectious Diseases

Start Here


Living With

Related Issues

Specific Conditions

Statistics and Research

Clinical Trials