There's been a worldwide surge in shingles cases for all ages in the past 60 years — and doctors are divided on the cause.

Some say it could be stress, while others point to immune-suppressing medications and better diagnosis. And there are concerns by the surge in cases among younger Australians.

Guests:

Professor Tony Cunningham, head of the Centre for Virus Research, Westmead Institute

Oliver Clarke, 27-year-old from Sydney who caught shingles last year

Producer: Anne Barker