Sadly, the measles virus is sparking grave concern worldwide, as the highly contagious airborne disease makes a resurgence. In recent months, it has been spreading in countries including the United States, the Philippines and Madagascar. News Stream CNN spoke to Prof. Heidi Larson, our IMPRINT steering committee member and director of the Vaccine Confidence Project on the issue. Heidi also joined the Al Jazeera inside story “ Why is measles back and spreading?