Measles is a highly contagious viral disease that causes fever, cough, and a rash. It was widespread before the development of a vaccine in the 1960s.
Think of measles as an uninvited party crasher who not only shows up without an invitation but also brings along unwanted gifts (symptoms) for everyone present. The vaccine is like having a really good bouncer at the door who recognizes this crasher and doesn't let them in.
Epidemic: An outbreak of disease that spreads quickly and affects many individuals at the same time.
Vaccine: A substance used to stimulate the production of antibodies and provide immunity against one or several diseases.
Immunity: The ability of an organism to resist a particular infection or toxin by producing suitable antibodies or sensitized white blood cells.
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