Health systems around the world are struggling to meet the needs of a changing population - and in some countries that's further strained by war, pandemics, and other emergencies. Dr. Vanessa Kerry, a physician at Massachusetts General Hospital, and co-founder and CEO of Seed Global Health, is committed to addressing this critical issue. She has helped train thousands of nurses and midwives in some of the world's most fragile communities, and is helping to lead a global movement to realize that success everywhere. As a new outbreak grips the world, many health workers in Wuhan are infected and some of them dying. Dr. Kerry speaks to James Chau.