"It's a paradox of public health that being too clean can sometimes lead to disease. For centuries, infants were routinely exposed to the poliovirus in their unsanitary living conditions. Polio rarely causes paralysis in infants, partly because of the maternal antibodies still present in their systems. In the 1900s, many countries cleaned up their water and sanitation systems, and houses in more affluent communities were routinely cleaned, reducing exposure to microbes. By the 1930s, '40s, and '50s, new mothers, especially those in the middle class, had no antibodies in their immune systems to pass on to their children. When children were exposed to the poliovirus in later years, they were defenseless against the disease."
https://www.pbs.org/wgbh/rxforsurvival/series/diseases/polio...
[0] https://www.cdc.gov/vaccines/vpd/polio/hcp/composition-dosag... [1] https://www.fda.gov/media/75695/download
Also in your second link, in page 8 says
> All children should receive four doses of IPV at ages 2, 4, 6 to 18 months, and 4 to 6 years.
Once everybody has encountered SARS2 at least once, it may become as harmless as the other endemic coronaviruses. That is to say, not entirely harmless, but nothing to lose sleep over.
It will never go away. How we deal with that is up to us.
Covid will stop being a concern only after safe and incredibly efficient antiviral drug is developed, which might take decades.
Antivirals have a very limited window of opportunity. Nothing will make our concerns disappear. At some point, we need to move on.
This is the inconvenient truth that absolutely nobody in the establishment is even remotely willing to even consider and a big part of the debate that is being replaced with an accusation contest.
What do we do when the vaccination program only works as promised by the scientists developing it, and not as hoped for by the politicians ordering it?
https://www.cdc.gov/vaccines/vpd/polio/hcp/effectiveness-dur...