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Disease Defense: Barrier Against Pathogens (1:08)
Our skin helps protect us from diseases by acting as a barrier.
Disease Defense: The Immune System (3:57)
The immune system contains white blood cells, which help destroy pathogens. Lymphocytes manufacture antibodies that help destroy pathogens.
Disease Defense: Immunity and Vaccination (3:06)
Vaccines may protect us from pathogens by causing the body to produce antibodies. Prior to 1955, before a vaccine was developed, many people died from polio.
Disease Defense: Antibiotics (1:33)
Antibiotics are used to treat diseases caused by bacteria. Some bacteria develop resistance to antibiotics.
Disease Defense: Autoimmune Diseases (0:37)
Autoimmune diseases occur when the immune system mistakes certain cells in the body for pathogens and attacks them.
