This study is controlled against people who had the flu during lockdown https://www.medrxiv.org/content/10.1101/2021.01.16.21249950v1 https://www.medrxiv.org/c

This study is controlled against people who had the flu during lockdown https://www.medrxiv.org/content/10.1101/2021.01.16.21249950v1 https://www.medrxiv.org/content/10.1101/2021.01.16.21249950v...