In early Nov 2017, several diphtheria cases presented at MSF facilities in refugee camps in Cox´s Bazar, Chittagong, Bangladesh. Around that time this area was home to over 600,000 Rohingya refugees from neighbouring Myanmar, the majority of which were settled in two main camps at Kutapalong and Balukhali. On 2 Dec, when the number of reported cases started to increase, we set up a collaboration to forecast disease incidence and spread, and help plan the medical response