Wales is in the grip of a measles epidemic, thanks to the anti-vaccine scare more than a decade ago. Once the critical mass of herd immunity dropped below a certain threshold, in came the old, deadly — and utterly preventable — disease.
Wales is in the grip of a measles epidemic, thanks to the anti-vaccine scare more than a decade ago. Once the critical mass of herd immunity dropped below a certain threshold, in came the old, deadly — and utterly preventable — disease.