Pennsylvania resident who worked convention in Palm Beach County tests positive for coronavirus... had been working in the Biogen vendor booth in the exhibitor’s area on Feb. 28.
Coronavirus symptoms: The progression from moderate to severe can occur ‘very, very quickly’
About 10-15% of mild-to-moderate patients progress to severe and of those, 15-20% progress to critical. Patients at highest risk include people age 60 and older and those with pre-existing conditions such as hypertension, diabetes and cardiovascular disease.
https://fortune.com/2020/03/08/coronavirus-symptoms-covid-19-lungs-nose-throat-cough/