title: A mystery bug wreaks havoc.
mesh_terms: D014943:Global Health; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D045473:Severe acute respiratory syndrome-related coronavirus; D045169:Severe Acute Respiratory Syndrome / Q000453:epidemiology* / Q000401:mortality / Q000517:prevention & control; D014195:Travel; D014481:United States