The Asian Development Bank (ADB) lends more than US$16bn to projects across the continent each year, primarily in the infrastructure field. Last year, just US$0.34bn of that lending went to health - but that is set to change as the bank's interest in social sectors is growing. So what role does the bank believe the private sector should play in the region's health systems? How will they achieve universal health coverage (UHC)? And how good is existing regulation? These are the questions we put to Susann Roth, a German doctor and public health specialist who has been with the bank for more than seven years.