lots of studies out
https://www.news-medical.net/amp/news/20211224/Children-with-pre-existing-immunity-to-common-cold-demonstrate-better-protection-against-COVID-19.aspx
https://www.medicalnewstoday.com/articles/common-cold-may-protect-against-sars-cov-2-infection-and-lead-the-way-to-new-vaccines
https://www.reuters.com/business/healthcare-pharmaceuticals/t-cells-common-colds-can-provide-protection-against-covid-19-study-2022-01-10/
