Conclusions: All identified outbreaks of three or more cases occurred in an indoor environment, which confirms that sharing indoor space is a major SARS-CoV-2 infection risk.
https://www.medrxiv.org/content/10.1101/2020.04.04.20053058v1.full.pdf
External Context سياق خارجي
https://www.medrxiv.org/content/10.1101/2020.04.04.20053058v1.full.pdf