13 measles cases are confirmed across New Zealand, with more than 2-thousand close contacts idenfied so far. Now one of the country's biggest schools has been affected. Auckland Grammar School has told students from Years 9 and 10 to stay home after someone with measles was there last week. Grammar is the third high school linked to a confirmed measles case as well as two in Wellington. University of Canterbury senior lecturer in epidemiology, Anna Howe spoke to Charlotte Cook.