Why do I become immune to it?
How does contagiousness work anyways?
In: Biology
In general when you survive any disease, you are then immune from it.
Colds and flus evolve just enough that each year it’s a different enough disease and your immunity from the previous year doesn’t count. But in the short time from you to your brother and back again – it’s still the same cold you have learned immunity to, so you can’t get it again 🙂
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