https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article CDC 10 study summary
That CDC article was published in May of 2020, so the research was done earlier, before covid, and in fact it states in plain English that it was all about influenza.
covid and the flu are both Rhinovirus
Nope. "COVID-19 is caused by SARS-CoV-2, while the common cold is most often caused by rhinoviruses." https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/covid-19-cold-flu-and-allergies-differences/art-20503981. See also: https://en.wikipedia.org/wiki/Virus_classification#RNA_viruses
So your old CDC link has nothing to do with covid.
Within the last month the CDC has repeatedly recommended the use of masks:
May 3, 2022 "Wearing a well-fitting mask or respirator is most beneficial in crowded or poorly ventilated locations, such as airport jetways. We also encourage operators of public transportation and transportation hubs to support mask wearing by all people, including employees." https://www.cdc.gov/media/releases/2022/s0503-covid-19-travel.html
April 20, 2022 "CDC continues to recommend that people wear masks in all indoor public transportation settings." https://www.cdc.gov/media/releases/2022/s0420-masks-public-transportation.html
May 3, 2022 "CDC recommends properly wearing a well-fitting mask or respirator over the nose and mouth in indoor areas of public transportation (such as airplanes, trains, buses, ferries) and transportation hubs (such as airports, stations, and seaports)" https://www.cdc.gov/coronavirus/2019-ncov/travelers/masks-public-transportation.html
https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article CDC 10 study summary
That CDC article was published in May of 2020, so the research was done earlier, before covid, and in fact it states in plain English that it was all about influenza.
covid and the flu are both Rhinovirus
Nope. "COVID-19 is caused by SARS-CoV-2, while the common cold is most often caused by rhinoviruses." https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/covid-19-cold-flu-and-allergies-differences/art-20503981
So your old CDC link has nothing to do with covid.
Within the last month the CDC has repeatedly recommended the use of masks:
May 3, 2022 "Wearing a well-fitting mask or respirator is most beneficial in crowded or poorly ventilated locations, such as airport jetways. We also encourage operators of public transportation and transportation hubs to support mask wearing by all people, including employees." https://www.cdc.gov/media/releases/2022/s0503-covid-19-travel.html
April 20, 2022 "CDC continues to recommend that people wear masks in all indoor public transportation settings." https://www.cdc.gov/media/releases/2022/s0420-masks-public-transportation.html
May 3, 2022 "CDC recommends properly wearing a well-fitting mask or respirator over the nose and mouth in indoor areas of public transportation (such as airplanes, trains, buses, ferries) and transportation hubs (such as airports, stations, and seaports)" https://www.cdc.gov/coronavirus/2019-ncov/travelers/masks-public-transportation.html