und 1.28<sup id="fnref8"><a href="#fn8" rel="footnote">8</a></sup>. This means, at the <em>start</em> of a flu outbreak, each <icon i></icon> infects 1.28 others <em>on average.</em> (If it sounds weird that this isn&#39;t a whole number, remember that the &quot;average&quot; mom has 2.4 children. This doesn&#39;t mean there&#39;s half-children running about.)</p>

	<p>The R<sub>0</sub> for COVID-19 is estimated to be around 2.2,<sup id="fnref9"><a href="#fn9" rel="footnote">9</a></sup> though one <em>not-y