So, a few things. Mutations occur when the virus transmits from one person to another. When there are enough mutations, then new variants can emerge.
Antibiotics don’t work on viruses. They work on bacteria. Not finishing your antibiotic can strengthen the bacteria strain. This is troubling because it can undermine our defense against bacteria.
Vaccines, on the other hand, reduce the likelihood of transmission. It is through transmission that mutations develop that can lead to “next generation” strains that have the potential to evade vaccines. By evade vaccines, we mean the vaccines weren’t developed to combat the new variant. That is how vaccine efficacy diminishes against a virus.
The way we avoid new mutant variants that are more transmissible or dangerous is to slowdown transmission. How do we do that? Vaccines! Why? Vaccines, though not perfect, drastically slow transmission! This is why you don’t worry about polio. So, get it right before you spout dangerous misinformation.