This is interim guidance on oxygen sources and distribution strategies for COVID-19 treatment. It has been adapted from WHO and UNICEF’s technical specifications and guidance for oxygen therapy devices, which is part of the WHO medical device technical series,1 and is based on current knowledge of the situation in China and other countries where cases have been identified.
Manual
https://www.who.int/emergencies/diseases/novel-coronavirus-2019/technical-guidance
WHO
2020