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Ticket agents work with travelers in the Southwest ticketing area at Mitchell International Airport in 2015. Passengers, unwilling to postpone plans, sometimes travel while sick. Passengers can also harbor a virus without showing symptoms, meaning that they aren't even aware that they could be passing a disease to fellow passengers. Image by Mike de Sisti/Milwaukee Journal Sentinel. United States, 2015.

Ticket agents work with travelers in the Southwest ticketing area at Mitchell International Airport in 2015. Passengers, unwilling to postpone plans, sometimes travel while sick. Passengers can also harbor a virus without showing symptoms, meaning that they aren't even aware that they could be passing a disease to fellow passengers. Image by Mike de Sisti/Milwaukee Journal Sentinel. United States, 2015.