The World Health Organization just returned from China. Here is their assessment and report
https://www.who.int/docs/default-so...na-joint-mission-on-covid-19-final-report.pdf
The text which gives the upbeat "80% mild" soundbite uses a different definion of "mild" than the bar chart A on page 29, which clearly shows that about 50% of cases are worse than mild (pneumonia, severe, critical).
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Most people infected with COVID-19 virus have mild disease and recover. Approximately
80% of laboratory confirmed patients have had mild to moderate disease, which includes
non-pneumonia and pneumonia cases,
13.8% have severe disease (dyspnea, respiratory
frequency ≥30/minute, blood oxygen saturation ≤93%, PaO2/FiO2 ratio <300, and/or lung
infiltrates >50% of the lung field within 24-48 hours) and
6.1% are critical (respiratory
failure, septic shock, and/or multiple organ dysfunction/failure).
Asymptomatic infection has been reported, but the majority of the relatively rare cases who are asymptomatic on
the date of identification/report went on to develop disease. The proportion of truly
asymptomatic infections is unclear but appears to be relatively rare and does not appear to
be a major driver of transmission.
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