Table 2.

Model parameter values and distributions

Infection parameters	Distributions
	Gonorrhoea	Reference	Chlamydia	Reference
Probability of infection being symptomatic
Male	β (0.9, 0.05)	[12-15]	β (0.30, 0.15)	[12,13]
Female	β (0.4, 0.15)	[12-15]	β (0.15, 0.08)	[12,13]
Duration of latent period (days)	U (3, 5)	[13,16-18]	U (12, 28)	[13,17,19]
Duration of asymptomatic infection in the absence of treatment (days)	Γ (105, 35)	[12,13,20]	Γ (220, 188)	[12,19,21-24]*
Duration of symptomatic infection in the absence of treatment (days)	Γ (105, 35)	[12,13,20]	Γ (112, 35)	[12,25]
Duration of immunity following recovery (days)	Γ (7, 3.5)	-	Γ (45, 15)	-
Transmission probability per sex act
Male to Female	β (0.2, 0.05)	[12,21,26,27]	β (0.16, 0.10)	[12,19,28,29]
Female to Male	β (0.4, 0.10)	[12,21,26,30,31]	β (0.12, 0.06)	[12,19,28,29]

Entries with no references are assumptions. U (l, u) denotes a uniform distribution with lower limit of l and upper limit of u; β (m, σ) denotes a beta distribution with mean of m and standard derivation of σ; Γ (m, σ) denotes a gamma distribution with mean of m and standard derivation of σ. Entries marked with ‘*’ indicate that the parameter has been adjusted in the model calibration process in order to generate realistic prevalences for gonorrhoea and chlamydia.