Soon. Very soon. After the 70 million Americans traveled during the Thanksgiving holiday it takes a few weeks for the sick to notice they are very ill and some will die. But also remember that Christmas is right soon too and many more millions will travel then after which in a few weeks bigger surges and spikes. The inevitable aftermath and consequences of their actions.
I don't know what percentage of duck quackers will be among the dead dying or permanently damaged. How many will need lung transplants or new livers. How many will be left with damaged brains?. Maybe a lot. Quieting them finally. What happens to duck when the TSUNAMI hits? Can he swim?