Harris and Woodson, both Black, are among several former NFL players participating in a campaign run jointly by the CDC and NFL Alumni Association, a nonprofit sponsored by the league that operates independently. They are trying to spread key messages about the pandemic -- particularly the need to get vaccinated, and to wear masks and practice social distancing while waiting their turn. The campaign relies primarily on social media posts and online videos for now, directing viewers to the CDC's homepage via Tweets and player endorsements on an NFL Alumni web pageopens in a new tab or window. Organizers hope...