15 IMMUNITYinCHILDREN Key Defenders of Immunity: • White blood cells – Act like policemen, traveling through the body to find and destroy germs. • Antibodies –Tiny proteins that recognize and fight infections. Vaccines help create antibodies in advance. • Skin – A strong shield that blocks germs from entering the body. • Tears and mucus – Wash away unwanted invaders before they cause harm.
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