Mystery #4Tier 3microbes / immunity
How does protecting yourself help protect other people too?
When you're protected from an illness, that's good news for you, but it turns out it's also good news for the people around you, including tiny babies and people who can't be protected themselves. How can your protection help someone else?
Your guess
What's your hunch about how you being protected from a germ could also help protect other people?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.