st become <icon e></icon> Exposed. This is when they have the virus but can&#39;t pass it on yet ‚Äì infect<em>ed</em> but not yet infect<em>ious</em>.</p>

	<p><img src="pics/seir.png" alt=""></p>

	<p>(This variant is called the <strong>SEIR Model</strong><sup id="fnref6"><a href="#fn6" rel="footnote">6</a></sup>, where the &quot;E&quot; stands for <icon e></icon> &quot;Exposed&quot;. Note this <em>isn&#39;t</em> the everyday meaning of &quot;exposed&quot;, when you may or may not have the virus. In t