The United States is a melting pot of different cultures. Polio is a typical example of the importance of immunization in all cultures. Polio enters the mouth, multiplies in the intestine and is excreted in the feces. While in the intestinal tract, the virus enters the bloodstream and can infect the central nervous system. Most people who get polio do not even know they are infected. Some have mild flu-like symptoms. An even smaller number get meningitis or paralysis. Meningitis and paralysis occur when polio virus infects the central nervous system. We want all our children and adults to be protected as we move from one culture to another.