Wearing masks to prevent the spread of the coronavirus was not widespread in March, when a group of German tourists took a long flight home from Israel — but researchers were surprised to find only two passengers outside the group had been infected.
In a short study published Tuesday in the US medical journal JAMA Network Open, virologists at a university hospital in Frankfurt, Germany meticulously contacted all of the passengers from the flight — none of whom had worn masks at the time — to examine the actual risk posed by the presence of travelers infected with COVID-19.
