This may shock you, but many children have already had exposure to the polio virus, never even knew it and have immunity, therefore the shot was not necessary. According to the Mayo Clinic:
Although polio can cause paralysis and death, the majority of people who are infected with the virus don’t get sick and aren’t aware they’ve been infected.
From the same link: “In the US, adults aren’t routinely vaccinated against polio because most are already immune, and the chances of contracting polio are minimal.”
They are already immune because they contracted the virus, became immune and didn’t even know it. Most people think the shot is not necessary for adults because the vaccine eradicated polio. That is a lie.
We still have polio today, mostly in areas where they continue to vaccinate aggressively. In fact, people are warned that they will be exposed to the polio virus if they travel to countries where the Oral Polio Vaccine (“OPV”) is used. That’s because the OPV contains the complete virus that will replicate and will transmit between humans.
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