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| Description: A vaccine is an inactivated form of bacteria or virus that is injected into the body to simulate an actual infection. Because the injected microorganisms are 'dead,' they don't cause a person to become sick. Instead, vaccines stimulate an immune response by the body that will fight off that type of illness. There are special cells in our bloodstream called white blood cells . They have the very important job of fighting off foreign invaders such as viruses and bacteria. These invaders are known as antigens. White blood cells are like the armed forces of our body. They are constantly on the lookout for antigens that have entered our body, compromising our health. Picture Stats: Views: 395 Filesize: 1.15MB Height: 1728 Width: 2304 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=41430 |