hat infectiousness started from 2.3 days (95% CI, 0.8‚Äì3.0 days) before symptom onset‚Äù (translation: Assuming symptoms start at 5 days, infectiousness starts 2 days before = Infectiousness starts at 3 days) <a href="https://www.nature.com/articles/s41591-020-0869-5">He, X., Lau, E.H.Y., Wu, P. et al.</a>  &nbsp;<a href="#fnref22" rev="footnote">&#8617;</a></p>

	<p><strong>4 days on average to infecting someone else:</strong> ‚ÄúThe mean [serial] interval was 3.96 days (95% CI 3.53‚Äì4.39