Table 1. Parameters of the susceptible-exposed-infectious-recovered model used to assess effects of social distancing measures during the first epidemic wave of coronavirus disease, Greece.

Epidemiologic parameters	Value	Comments and references
R0 (95% CI)	2.38 (2.01–2.80)	Estimated from data on the number of confirmed cases in Greece by accounting for imported cases and assuming gamma distributed serial interval with mean 6.67 days (SD 4.88 days) (D. Cereda et al., unpub. data, https://arxiv.org/abs/2003.09320) and aligned with other studies (10,11)
Latent period (1/σ)	3.5 days	Based on an average incubation time of ≈5 days (8,9) and assuming that infectiousness starts 1.5 days prior to the symptom onset (22–24)
Percentage (p) infected cases developing symptoms	80	From K. Mizumoto et al. (21), the estimated proportion of true asymptomatic cases was 20.6% assuming a mean incubation period of 5.5 days
Symptomatic cases
Length of infectiousness before symptoms, d (1/σs)	1.5	(22–24)
Duration of infectious period from development of symptoms to recovery, d (1/γs)	4.5	To obtain a serial interval of ≈6 days (8,9)
True asymptomatic cases
Infectiousness (q) of asymptomatic vs. symptomatic persons, %	50	(24)
Duration of infectious period until recovery (1/γasymp)	6 days	The same duration of infectiousness as for symptomatic cases = 1/σs + 1/γs