Scientists at Pfizer and Moderna are using the mRNA technology that helped Covid-19 vaccines succeed in exploring ways to inoculate the masses from the flu.

Existing flu vaccines are only 40% to 60% effective in preventing infection, and sometimes by a flu season’s end only 10% effective.

From 2010 to 2020, the CDC estimates that the flu caused between 12,000 and 52,000 deaths in the U.S. annually, from among nine million to 41 million infections.