The preprint of this article was published on Feb 7th: https://www.medrxiv.org/content/10.1101/2020.02.07.20021154v1.full.pdf https://www.medrxiv.org/content/10

The preprint of this article was published on Feb 7th: https://www.medrxiv.org/content/10.1101/2020.02.07.20021154v1.full.pdf https://www.medrxiv.org/content/10.1101/2020.02.07.20021154v... The authors of this study are almost certainly not the only ones who "knew" it was twice as infectious based only on the data available back in early February, before anyone outside of China was testing at all.