They are looking at data from hospitals, so I'd expect mild cases to be excluded. Semantic nuances seem to be very relevant to the applicability (or not) of th

They are looking at data from hospitals, so I'd expect mild cases to be excluded. Semantic nuances seem to be very relevant to the applicability (or not) of this selection to the exact wording of the result: is a SARS-CoV-2 infection that remains harmless because it is overcome before spreading from throat to lungs classified as a light case of Covid-19 or is that label reserved for more serious forms of infection?