This is ultra basic but from the clowns at NHS so even they admit it. https://www.nhs.uk/common-health-questions/childrens-health/how-long-do-babies-carry-their-mothers-immunity/ True immunity is passed from mother to child during pregnancy. If I am not mistaken, during the last three months. If your parents (mom) had chicken pox and they most likely did then you have an immunity. It is why it is almost unheard of today. Not because of vaccines but most likely but because of real immunity. They will say it is only a temporary immunity but that is not how immune systems work. Immune systems are like computers. They collect and chronicle data. Once the immunity is encoded, it stays. Dating back to at least the 1940's in this country Smallpox was a recommended immunization. https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-history/developments-by-year The likelihood of any pox breaking out here that is not bioengineered is virtually nonexistent. I suspect the smallpox "vaccines" created the chicken pox that passed through this country. That's obviously not what the news will say but ....