Table 1. Parameter definitions and values.

Symbol	Definition	Value	Source*
	Progression rate from acute to carrier for HBV	0.4/person/year	[27]–[29]
	Recovery rate from acute infection with HBV	3.6/person/year	[27]–[29]
	Recovery rate from chronic infection with HBV	0.02/person/year	[25], [28]
	Transmission risk of HBV from person with HBV only, stage 1	0.46	[25], [30]
	Transmission risk of HBV from person with HBV only, stage 2	0.65	[25], [30]
	Progression rate from acute to carrier for those dually infected	2/person/year	[2], [28], [31]
	Recovery rate from acute infection for those dually infected	2/person/year	[2], [28], [31]
	Recovery rate from chronic infection for those dually infected	0.02/person/year	[25], [28]
	Transmission risk of HBV from person with dual infection, stage j = 1, 2	0.71	[6]
	Transmission risk of hepatitis D from person with dual infection, stage j = 1, 2
n	Initial total population size	26000	[32]
μ	Rate of departing from the population	0.018/year
B	Rate at which individuals enter the uninfected population	μn
ϕ	Rate of partner change	1.64 partners/year	[33], [34]

HBV, hepatitis B virus. Dually infected are individuals infected with both hepatitis B and hepatitis D viruses. The transmission risks are expressed as probabilities of transmission per partnership. The stages 1 and 2 of infection (single HBV and dual) are the acute and the chronic stages, respectively.

^*See details in the Supporting Information, text S1.