Isolated during the first year of the Covid-19 pandemic, I started to follow on Twitter (the social media platform now called X) a few scientists who were dedicating part of their time to sharing information about disease prevention. From that personal curiosity emerged an interest in a feud happening between tweets, likes, and retweets: the World Health Organization had tweeted a “fact-checking” publication stating that Covid was not airborne. Denying the relevance of human-to-human airborne transmission of SARS-CoV-2 was seen as a mistake by some at that time, March 28, 2020, and came at a high cost for the organization’s public image. (read more...)