Chicken pox and shingles are from the same herpes virus. Having either chicken pox or a chicken pox vaccine do give you some immunity, but the sad truth is that we lose memory B-cells as we age. So people do get shingles even though they had some immunity earlier against the virus. Apparently the Shingrix vaccine is very good: Like >90% effective.

But there is a caveat. CDC says: If you test negative for immunity to varicella zoster virus, you should get chickenpox vaccine instead.

Interesting factoid: Studies show that more than 99% of Americans 40 years and older have had chickenpox, even if they don’t remember having the disease.

Educating anyone benefits everyone.