ensive care unit is needed Abbreviations: FiO2, fraction of inspired oxygen; GGO, groundā€glass opacity; MODS, multiple organ dysfunction syndrome; PaO2, partial pressure of oxygen; RR, respiratory rate, SpO2, oxygen saturation. John Wiley & Sons, Ltd. This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency. 5.2 Epidemiological history Shortly after the onset of the e