Screen Shot 2020-04-04 at 08.39.11.pngAs many as 25 percent of people infected with the new coronavirus may not show symptoms, the director of the Centers for Disease Control and Prevention warns — a startlingly high number that complicates efforts to predict the pandemic’s course and strategies to mitigate its spread.

In particular, the high level of symptom-free cases is leading the C.D.C. to consider broadening its guidelines on who should wear masks…..more