Just make sure your son is topped up on D3.
That’s the best defense right now.
You’ve got until about mid Oct for him to get it naturally. Supplements after that.
Yes, well he is one who is outside every chance he gets. He’s either playing frisbee or on the lake fishing. His friends are giving him heck on FB for that, but he swears that he and his friends are safer doing that than being inside. That really could be the reason why he hasn’t gotten sick.