Shingles cases are almost 1-to-1 kids who were vaccinated for chickenpox. It's exploded since the introduction. It's a situation where the drug created a problem and then another drug came along to fix the problem it created.

The author of "The Moth in the Iron Lung" has been making the podcast circuit. I really recommend listening to one of his interviews. He does a good job of going into the who mythology of medicine.

..and remember, Jenner discovered using horsepox/cowpox as a vaccine 185 years ago. But the Chinese started the trend of inoculating people with the actual disease 500 years ago: grounding up the puss from people with pox, blowing them in people's noses (people who survived were considered immune). This inoculation technique spread all over Europe for hundreds of years to stop "smallpox" (and we have no idea if any of them have what we would consider "smallpox" today).