Two things.
1. AA now has a "Travel Alert" allowing rebooking without change fees, to include not traveling for up to 331 days to Wuhan, Bejing and Shanghi.
https://www.aa.com/i18n/travel-info/travel-alerts.jsp
2. Lancet published a paper of the initial cases of Corona virus in Wuhan and these cases of Corona virus pneumonia did NOT occur primarily in people with underlying illnesses but in otherwise healthy people. I downloaded the paper in PDF but don't have the link, sorry.
All the best.