@dyckron Last year I was worried about the measles outbreaks. So I had my DO do a blood test since I lost my baby book decades ago. I have the antibodies. But reading articles on measles point out that having had measles just means that if you get it again, you won't be as miserable as the first time. And you won't be contagious.
So I'm still wearing a mask when I'm out shopping. And I haven't had the flu or a cold since the 2020 lockdown.