There is no such thing as an immunization that works like some magic shield that prevents you from getting the illness. This is just as much true for the COVID vaccine as it is for flu, measles, polio, smallpox, varicella zoster, etc.
The pathogen can still enter your body, but the result is that your immune system has now been immunized with the appropriate signaling proteins to effectively destroy the pathogen, preventing more serious illness.
The reason smallpox was eradicated was both because of this way that the vaccine worked but also because we had a massive vaccination rollout. Once *everyone got immunized against it, what was left of the virus spreading around was quickly killed by immune systems, and it couldn’t spread to that *small number of people who legitimately could not take the shot for medical reasons.
We could have similar success with COVID but for some reason half the country has lost their damn minds about basic medical science and clearly didn’t deserve the passing grades they got in high school biology.
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