How vaccines work: how a shot trains your immune system
Herd immunity: how your vaccine protects a baby too young for one
A baby too young for a measles shot can still be kept safe from measles by the people around it. How can a shot in your arm protect someone else, and why does measles need almost everyone?
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The day has come, and you visit Miva and her baby. You had both of your measles shots, and your body is ready for measles. The baby is not: in many countries, the first measles shot comes at about one year old.
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Measles spreads through the air, and it can stay in a room for up to two hours. Where nobody is immune, one person with measles can pass it to up to 18 others.
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