With the coronavirus still spreading widely, it’s time to start thinking seriously about influenza, which typically spreads in fall and winter. A major flu outbreak would not only overwhelm hospitals this fall and winter, but also likely overwhelm a person who might contract both at once. Doctors have no way of knowing yet what the effect of a dual diagnosis might be on a person’s body, but they do know the havoc that the flu alone can do to a person’s body. And, we know the U.S. death toll...