Travelers pass a sign near a COVID-19 testing site in Terminal E at Logan Airport, on Dec. 21, 2021, in Boston. The nation’s top public health agency is expanding a program that tests international travelers for COVID-19 and other infectious diseases. The Centers for Disease Control and Prevention currently operates a program at six U.S. airports that asks passengers from inbound international flights to agree to nose swabs and answer questions about their travel. (AP Photo/Charles Krupa, File)
