Table 2.

Comparison of complete opening vs. full closure for various values of the external rate of infection $\alpha$. Cases include asymptomatic. An initial screening is assumed so that there are no active cases at school start. Column 2 indicates cases per million in the surrounding area; the correspondence with $\alpha$ is based on an average contact rate (see Section 2.3).

$\alpha$$\left[h^{-1}\right]$	Cases per million	$\text{\%}$ cases at school end		Number of cases by 60 days in a school of 1000
		Remote	In-class	Remote	In-class
$10^{-8}$	0.5	0.006	0.1	0	0
$10^{-7}$	5	0.06	1	0	1
$10^{-6}$	50	0.67	7.1	1	7
$10^{-5}$	500	6.5	27.33	14	64
$2\times 10^{-5}$	1110	12.57	37.80	28	115
$10^{-4}$	5000	48.93	70.51	134	353
$10^{-3}$	50000	99.87	99.81	753	859