an> after 1 year, on <em>average</em>, with variation:</p>

	<div class="sim">
	        <iframe src="sim/?stage=yrs-1&format=lines&height=600" width="800" height="600"></iframe>
	</div>

	<p>Return of the exponential decay!</p>

	<p>This is the <strong>SEIRS Model</strong>. The final &quot;S&quot; stands for <icon s></icon> Susceptible, again.</p>

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

	<p>Now, let&#39;s simulate a COVID-19 outbreak, over 10 years, with no interventions... <em>if immunity only lasts a 