The Delta variant is a ‘serious threat’ as contagious as chickenpox, the C.D.C. finds.

By BY APOORVA MANDAVILLI from NYT World
The Delta variant is a ‘serious threat’ as contagious as chickenpox, the C.D.C. finds. The Delta variant is a ‘serious threat’ as contagious as chickenpox, the C.D.C. finds.