Fall in North America, the start of flu season, is when many people receive their yearly flu vaccine. The flu shot differs from other vaccines, such as measles or mumps, which are generally given only once during a person’s lifetime. The flu shot is given every year because the flu virus is constantly changing, and vaccines must keep up with new forms of the virus. Listen to learn more about the flu, including how cold weather helps it spread, which animals can get the flu, and why it’s important to get a flu vaccine each year.
Story Length: 4:42
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