Anyone who has had kids in school or daycare for the past 2 years and doesn't think their immune system has been repeatedly exposed and assaulted by SARS-CoV-2 is completely out of their mind. My 2 year old spends a good half the year hacking coughing and snotting, it's laughable to think she hasn't already contracted (and her immune system built anti-bodies to), perhaps multiple times, one of the most common viral illnesses of the past two years. If you didn't want your child to acquire some natural immunity, the time for covid vaccination was almost 3 years ago (before the vaccine existed).