Table 1.

List of model parameters.

parameter	meaning	fixed value or interval (influenza–SARS-CoV-2 analysis)	fixed value or interval (global sensitivity analysis)	source/comment
${\sigma }_1^{-1}$	average latent period of influenza	1 day	$\begin{array}{rl}& {\sigma }_1^{-1}={\sigma }_2^{-1}={\sigma }^{-1}\\ & {\sigma }^{-1}\in [1-14]\hspace{0.17em}\mathrm{days}\end{array}$	[24]
${\sigma }_2^{-1}$	average latent period of SARS-CoV-2	4 days		[25]
${\gamma }_1^{-1}$	average infectious period of influenza	4 days	$\begin{array}{rl}& {\gamma }_1^{-1}={\gamma }_2^{-1}={\gamma }^{-1}\\ & {\gamma }^{-1}\in [4-14]\hspace{0.17em}\mathrm{days}\end{array}$	[26]
${\gamma }_2^{-1}$	average infectious period of SARS-CoV-2	5 days		[25,27]
R1	reproduction number of influenza	1.3	$\begin{array}{rl}& R_1=R_2=R\\ & R\in \{1.5,2.0,2.5\}\end{array}$	[23]
R2	reproduction number of SARS-CoV-2	2.5		[25]
e0,1	initial fraction exposed to influenza	10−3	e0,1 = e0,2 = 10−5	assumption: influenza circulated before SARS-CoV-2 [28]
e0,2	initial fraction exposed to SARS-CoV-2	10−5
r0,1	initial fraction immune to influenza	0.4	$\begin{array}{rl}& r_{0,1}=r_{0,2}=r_0\\ & r_0\in [0.0-0.4]\end{array}$	[29]
r0,2	initial fraction immune to SARS-CoV-2	0		assumption
${\delta }^{-1}={\delta }_1^{-1}={\delta }_2^{-1}$	average post-infectious period	1–14 days	1–14 days	[30]
${\theta }^{(I)}={\theta }_1^{(I)}={\theta }_2^{(I)}$	strength of interaction during infectious period	0.2–5	1–5	assumption
${\theta }^{(T)}={\theta }_1^{(T)}={\theta }_2^{(T)}$	strength of interaction during post-infectious period	0.2–5	1–5	assumption