Table 1 Model parameters values/ranges.

From: Contact tracing is an imperfect tool for controlling COVID-19 transmission and relies on population adherence

Parameter

Values

Refs.

Number of initial cases

5

 

Effective reproduction number under physical distancing, RS

1.3, 1.5

 

Dispersion of RS, k

0.23

27

Proportion asymptomatic

31%

22

Delay: onset to isolation

1 day

 

Incubation period (Lognormal)

Mean log: 1.43

23, 24

Incubation period (Lognormal)

sd log: 0.66

23, 24

Infection time (Gamma)

Shape: 17.77

23

Infection time (Gamma)

Rate: 1.39 day−1

Fitted from23

Infection time shift

−13.0 days

23

Untraced self-isolation prob.

18.2%, 70%

Based on12

Self-reporting probability

11.9%, 50%

Based on12

Traced isolation adherence prob.

10.9%, 65%, 90%

12

Contact tracing coverage

0–80%

 

Test sensitivity

65%, 95%

26, 35, 40, 41

Time to test result (days)

0, 2

 

Isolation duration if −ve test

7 days

 
  1. Parameters taken from the literature are fixed and for other parameters a range of values are explored.