COVID-19 is a contagious new virus and much remains to be understood. Unlike influenza, there is no known pre-immunity, no vaccine, no specific treatment and everyone is presumed to be susceptible. MSF is very concerned how the COVID-19 pandemic will affect people in countries with already fragile health systems. On any given day, our staff treats tens of thousands of patients for a variety of illnesses in our medical programmes around the world. In many areas where we work, there are few medical organisations in a position to respond to an overload of patients.