Table 1.

List of Epidemiological States and the Instantaneous Net Benefits of Contact in Those States, $V_i({\mathit{\varphi }}_{ij}(t))$.

	Description	Will mix selectively	Net benefit
S	Susceptible	Yes	B S − C s(ϕ SI(t))
E	Latently infected: asymptomatic and noninfectious	Yes	B E − C s(ϕ SI(t))
A	Asymptomatically infected	Yes	B A − C s(ϕ SI(t))
$R_A$	Recovered from asymptomatic infection, immune	Yes	$B_{R_A}-C_s({\mathit{\varphi }}_{SI}(t))$
I	Symptomatically infectious	No	B I − C I(I(t))
R	Recovered from symptomatic infection, immune	No	B R

Susceptible, exposed, asymptomatically infectious, and recovered (from asymptomatic infection) individuals all choose to mitigate risk as if they were susceptible and thus carry the cost of mitigation.