Early on, they didn't know if masks were effective against covid, because of the size of the particles. But they did still recommend them for healthcare worke

Early on, they didn't know if masks were effective against covid, because of the size of the particles. But they did still recommend them for healthcare workers: https://www.news-medical.net/news/20200130/Do-masks-protect-from-Coronavirus.aspxhttps://www.news-medical.net/news/20200130/Do-masks-protect-from-Coronavirus.aspx https://www.news-medical.net/news/20200130/Do-masks-protect-... They were saying not to buy masks in order to preserve them for healthcare workers. There was already a severe shortage of them. https://news.yahoo.com/cdc-warns-save-respirator-masks-for-healthcare-workers-162144855.html https://news.yahoo.com/cdc-warns-save-respirator-masks-for-h...