Approximately one million Rohingya persons who fled waves of violence in Myanmar at different times, the latest being 25 August 2017, now live in two coastal districts in Bangladesh; Cox’s Bazar and Bandarban (1). In makeshift shelters made from bamboo and tarpaulin in camps sprawling through rough terrains, the Rohingya live in conditions of overcrowding, poor sanitation, high malnutrition and, on arrival, extremely low vaccination coverage (1-3). The United Nations described the situation as the fastest growing refugee crisis and a major humanitarian emergency (4).