A leading epidemic expert says she's "still hopeful" the NSW COVID-19 outbreak will stay under control, despite the Delta strain putting the state at risk of a larger outbreak.

Professor Raina MacIntyre says we need to be vaccinating children from age 12 in order to achieve herd immunity against the more highly transmissible variants.

Guest: Professor Raina MacIntyre, Head of the Kirby Institute's Biosecurity Research Program at the University of New South Wales

Producer: RN Breakfast's Political Editor Alison Carabine

HEAR THE INTERVIEW