Table 2 Expanded compartments based on public health interventions

Categorize the susceptible

S_p

Protected susceptible^a

[20]

S_c

Confined susceptible^a

[21]

S_r

Behavior changed susceptible^a

[24]

M, U

Masked/unmasked humans

[23]

Hospitalization/quarantine

H

Hospitalized infected

[25]

Q

Quarantine

[28]

S_q, E_q

Quarantined susceptible (S_q), quarantined exposed (E_q)

[26]

Active nucleic acid testing and notification of confirmed cases

M

Missed cases

[29]

Q₁, Q₂

Suspected population under home quarantine (Q₁), medical quarantine population of confirmed cases (Q₂)

[30]

I_r, I_u

Tested infected individuals (I_r), non-tested infected individuals (I_u)

[27]

I₁, I₂

Infectious people with timely diagnosis(I₁), delayed diagnosis (I₂)

[31]