apparently people can have a mild chickenpox infection, and then you get it again, and its as if you never had it before. also the reason why some people get the vaccine and then get shingles down the line, the vaccine suppresses it to subclinical infection, so you wouldnt know, and then you get infected with the wild version, and then develop shingles later. chickenpox is one of the weird infection that the vaccine doesnt entirely protect against mainly because like most herpes it begins to travel to your neurons and dorsal ganglia when infection starts(your immune system doesnt attack your nerves for good reason and the virus has ways of evading your immune system as well), the main point it protects agianst severe infections, much like with covid vaccine.