Let’s Get Vaccinated for Both Flu and COVID-19:On the World Flu Day 2021

This year marks the fourth World Flu Day on November 1.In 2018,on the occasion of centenary of the 1918 flu pandemic,the first World Flu Day was formally initiated and developed by leading influenza specialists in China and all over the world at a symposium in Shenzhen,China,with the theme to“Commemorate the Centenary of the 1918–19 Influenza Pandemic”(1).Scientists and representatives from different international associations and organizations.