Single mutation is all that was needed to get to Covid-19 (2019) User bprogramming, in the Beginner Programming and Tech subreddit, 25 Mar 2020
This year old paper predicted the outbreak User Redsandro, in the Novel Coronavirus (COVID-19) subreddit, 12 Feb 2020
"Thus, it is highly likely that future SARS- or MERS-like coronavirus outbreaks will originate from bats, and there is an increased probability that this will occur in China." [March 2019] User 1913intel, in the Emerging Risks subreddit, 07 Feb 2020