The measles outbreak in New Zealand is really concerning for LOTS of people, particularly the parents of unimmunised children.
But there's a section of the population who CAN'T get immunised because their bodies can't handle it.
These people are on immuno-suppressants. They're a LOT more common than you think. And if they get the measles, it's a LOT more serious than it would be for most of us
Jo Denvir's 12 year-old son Max is in that boat - Jo's on the line now to tell us more about his situation