"Given the numbers of mumps cases there's been in Auckland and given the efforts there have been to try and contain the spread of mumps in Auckland, it's very clear that we need to do some additional vaccination programs," she told Radio New Zealand.
The ministry would work with DHBs to decide how to best target the age group of 11-29 year olds, whether that's through schools, tertiary institutions or health providers, McElnay said.
Radio New Zealand reported that Immunisation Advisory Centre director of research Helen Petousis-Harris said reaching the 11-29 age group would be difficult.
"You can't just target schools, you've got to think how can we best serve these people and it's going to involve a lot of strategy," Petousis-Harris said.