Add Yahoo as a preferred source to see more of our stories on Google. Getty Images/triocean If you’re in your 40s or older, you might have memories of having chickenpox—the once-common childhood virus ...

If you’re in your 40s or older, you might have memories of having chickenpox—the once-common childhood virus was a rite of passage that usually involved a week of itchy fluid-filled blisters, lots of ...