I got sick with a cold. I started to feel better then my wife got sick with a cold. What’s preventing me from getting sick from the cold that she has now in the future, just like she got sick from my cold and then she getting sick again from my “next cold”, etc — like an infinite loop of colds?

Question

I got sick with a cold. I started to feel better then my wife got sick with a cold. What’s preventing me from getting sick from the cold that she has now in the future, just like she got sick from my cold and then she getting sick again from my “next cold”, etc — like an infinite loop of colds?

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Answer 1

Your body produces anti-bodies that specifically match what you are sick with. These take a few days to come online but they are so effective they will both cure your current illness and prevent you from getting sick with that illness in the next few months.

That’s basically why vaccines work, they just trick your body into producing immune cells that match an invader that isn’t actually harmful so when the real version comes along your body is ready to recognize and fight it immediately.