China’s mysterious respiratory virus has caused six deaths and infected a number of medical workers, a sign the outbreak has entered a new phase with the illness spreading from person to person.
Health-care workers contracting the new illness indicates that it is more easily transmitted than previously thought, bringing the outbreak to a higher risk level, reminiscent of the severe acute respiratory syndrome, or SARS, pandemic that killed 800 people in Asia 17 years ago. China on Tuesday
As hundreds of millions of Chinese prepare to travel across the country and globally ...