Why do you gain resistance to some illnesses after having them but not others?
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There are two explanations I know of.
Diseases mutate over time, some faster than others. Sometimes they mutate in a way that your immune system doesn’t recognize them as the same disease again.
The other reason I know is that we simply don’t know. Our body is very complex and there are things we still don’t understand. Some anti bodies just stay longer in our blood than others and we don’t know why yet.
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