**Note**: I just got my Flu and COVID-19 shot, so I’m not anti-vax, just curious to know more from people who are better educated on vaccines than I am.
I understand that it’s important for our immune systems to be exposed to viruses in order to build immunity, but why is it that diseases like Polio, Measles, Mumps, and Smallpox are basically nonexistent (save for random outbreaks) while thousands of people will get colds and flus each year and the best we can do is get a flu shot, wash our hands, mask in public spaces and hope you don’t come into contact with someone who’s sick? Could it ever be possible to make a vaccine that completely prevents people from getting colds or flus?
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Imagine your immune system uses facial recognition to turn away pathogens. Things like polio, mumps, dengue etc. don’t get allowed entry because it recognizes those faces as threats and security doesn’t allow them in.
Now imagine influenza (H and N proteins) and covid are able to change their face pretty quickly so every time they come back they fool the facial recognition software into letting them in.
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