Table 1.

Serotype-Specific Model Inputs^a

Model Input	Source(s)	Serotype 1 Estimate	Serotype 2 Estimate	Serotype 3 Estimate
Basic reproduction number (R0) for WPV or fully reverted VDPV, relative to serotype 1	[7, 37]	1 (reference)	0.9	0.75
Relative R0 of OPV parent strain to WPV or VDPV	[7]	0.37	0.55	0.25
Average time (days) to revert from OPV to fully reverted VDPV	[37]	620.5	408	620.5
Average paralysis-to-infection ratio for fully susceptible individuals	[7]
WPV		1/200	1/2000	1/1000
OPV		7.4 × 10–8	6.2 × 10–7	1.3 × 10–6
Average per-dose OPV take rate for population modeled in Figure 2	[21]	0.42 (bOPV)	0.60 (tOPV)	0.42 (bOPV)

Abbreviations: bOPV, bivalent oral poliovirus vaccine; OPV, oral poliovirus vaccine; tOPV, trivalent oral poliovirus vaccine; VDPV, vaccine-derived poliovirus; WPV, wild poliovirus.

^aExcluding small serotype differences in characterization of immunity states [7].