Does Influenza Vaccination Reduce the Risk of Contracting COVID-19?
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9504696/
Flu vaccine could cut COVID risk
https://www.nature.com/articles/d41586-022-01315-9
Nature:流感疫苗能降低新冠重症90%,有奇效!這,啥意思?
https://www.medsci.cn/article/show_article.do?id=ca81e279102e