Online learning for clinical management staff of respiratory diphtheria in Cox's Bazar, Bangladesh. In December 2017, the WHO Health Emergencies Programme launched an online learning for clinical staff on respiratory diphtheria through the OpenWHO.org platform. The 4-hour course targets clinicians caring for patients during outbreaks in vulnerable settings, such as in Cox's Bazar. It is also applicable to clinicians working in settings that share similar challenges, due to limitations of: laboratory capacity, availability of treatment facilities, number of trained staff, medications, medical supplies, and supportive care. With the OpenWHO App, users can now view course content on a mobile device, with or without internet connection, once it has been downloaded: an important feature needed in vulnerable settings. Material is now being translated into Bahasa Indonesia and Arabic.