This quote from the CMU article lines up with the headline on this HN discussion thread (200M, 62%, bots, COVID-19):
> CMU researchers since January have collected more than 200 million tweets discussing coronavirus or COVID-19. Of the top 50 influential retweeters, 82% are bots, they found. Of the top 1,000 retweeters, 62% are bots.
Fascinating article. Thank you for taking the time to find it.