This all comes back to two behaviors that are needed. For the annual flu, get a flu shot. With 50% or less of the public availing themselves of this annual protection, that leaves a significant number of people exposed to complications from the flu and thus needing hospitalization.
For COVID-19, with no vaccine available, the action needed to prevent that disease is the wearing of a mask. Even the transmission of the flu virus can be knocked down by people doing all the right things, washing hands, social distancing, wearing a mask, avoiding gatherings of people--especially inside as cooler weather comes back.
CDC Director Dr. Robert Redfield summed it all up when asked what Thanksgiving will look like in the U.S., Redfield said, "It depends on "how the American people choose to respond."