Why aren't vaccines 100% effective?
The short answer: Because nothing is.
The longer answer:
Individual immune systems are different enough that in some cases, a person’s immune system will not generate an adequate response. As a result, he or she will not be effectively protected after immunization.
That said, the effectiveness of most vaccines is high. After receiving the second dose of the MMR vaccine (measles, mumps, and rubella) or the standalone measles vaccine, 99.7% of vaccinated individuals are immune to measles. The inactivated polio vaccine offers 99% effectiveness after three doses. The varicella (chickenpox) vaccine is between 85% and 90% effective in preventing all varicella infections, but 100% effective in preventing moderate and severe chicken pox.
In every single article, every single piece of literature I read - and it has been A LOT - there hasn't yet been a claim that any vaccine is 100% effective. The claim that has been made is that vaccines are our best chance against either never contracting an infectious disease at all or contracting only a mild case.
It's worth noting that natural infection also does not provide 100% protection.
{You can find all the sources I used by clicking here.}
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