Varicella transmission coefficient

β

325 [27]

120–500

Rate of becoming infectious with varicella

ω

26 [21]

20–32

the base value corresponds to the average latent period of ≈ 14 days
   
Varicella recovery rate

γ

50 [21]

40–60

the base value corresponds to the average infectious period of ≈ 7.3 days
   
Loss of full immunity rate

σ

0.10 [4,9,17]

0.0125–4.0

the base value corresponds to the average duration of “full” immunity of 10 years
   
Varicella force of infection reduction coefficient for those

ζ

0.10 [assumed]

0.0–1.0

who become reinfected following clearance of varicella
   
Varicella force of infection reduction coefficient for those

α

0.90 [assumed]

0.0–1.0

who become reinfected following HZ attack
   
Boosting coefficient

κ

3.0 [assumed]

0.0–20.0

Birth/death rate

μ

0.0122 [29]

0.01–0.05

the base value corresponds to the average life expectancy of ≈ 82 years
   
HZ reactivation rate

η

0.05 [4,15,17]

0.0001–2.0

HZ recovery rate

ρ

52 [17]

46–58

the base value corresponds to the average infectious period of ≈ 7 days
   
Rate of HZ reactivation after loss of immunity following recovery from HZ

δ

0.01 [12,23]

0.00–0.10

Rate of loss of immunity to VZV after recovery from HZ

θ

4.0 [assumed]

0.00–12.0

the base value corresponds to immunity lasting 3 months on average
   
Relative VZV infectiousness of HZ

p

0.001 [10,17]

0.00–0.10
