FIGURE 4.

Suggested management according to severity grade. Grade 1: asymptomatic, clinical or diagnostic observation only; intervention not indicated; Grade 2: symptomatic, medical intervention indicated; limiting instrumental activities of daily living; Grade 3: severe symptoms; limiting self-care activities of daily living, oxygen indicated; Grade 4: life-threatening respiratory compromise; urgent intervention indicated (e.g. tracheotomy or intubation). ^#: a disorder characterised by inflammation focally or diffusely affecting the lung parenchyma.