How vaccines work: how a shot trains your immune system
Why you need a flu shot every year, but measles shots last for decades
A measles shot is given in childhood, and its protection usually lasts for decades. Flu vaccines are made new every single year, because of something the flu virus does each time it copies itself.
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Every autumn, Rono gets a flu shot, and every year it is a new vaccine. Experts choose what goes into it again, each year, for the flu season ahead.
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All year, about 150 flu labs in more than 120 countries test thousands of flu viruses from sick people. They watch which flu viruses are spreading.
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