The spread of hepatitis E in Diffa region slowed down since MSF began detecting and treating cases in early 2017, and the subsequent declaration of an outbreak by the Ministry of Health in mid-April 2017. The number of fatalities dropped, thanks to active case-finding, quicker diagnosis, water chlorination and awareness-raising activities. Our teams helped to treat patients and set up an intensive care unit for pregnant women, for whom – and for whose unborn babies – the risks are most severe.