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Volume 27, Number 2—February 2021
Research

Effects of Social Distancing Measures during the First Epidemic Wave of Severe Acute Respiratory Syndrome Infection, Greece

Vana SypsaComments to Author , Sotirios Roussos, Dimitrios Paraskevis, Theodore Lytras, Sotirios Tsiodras1, and Angelos Hatzakis1
Author affiliations: National and Kapodistrian University of Athens, Athens, Greece (V. Sypsa, S. Roussos, D. Paraskevis, S. Tsiodras, A. Hatzakis); National Public Health Organization, Athens (T. Lytras); European University Cyprus, Nicosia, Cyprus (T. Lytras)

Main Article

Figure 2

Modified susceptible-exposed-infectious-recovered (SEIR) model used to estimate the course of the first epidemic wave of coronavirus disease, Greece. Cases are classified into susceptible (S), exposed (E), infectious (I, which is divided into 3 conditions: Ipre, before developing symptoms, Isymp for clinically ill, or Iasymp for true asymptomatic), and recovered (R). We assumed that a proportion (p) of exposed cases will develop symptoms and that infectiousness can occur before the onset of symptoms. β is the rate at which persons become infected and move to E; exposed individuals become infectious at a rate σ and presymptomatic infectious cases develop symptoms at a rate σs; γasymp is the rate of recovery for asymptomatic persons; γs is the rate of recovery for symptomatic persons.

Figure 2. Modified susceptible-exposed-infectious-recovered (SEIR) model used to estimate the course of the first epidemic wave of coronavirus disease, Greece. Cases are classified into susceptible (S), exposed (E), infectious (I, which is divided into 3 conditions: Ipre, before developing symptoms, Isymp for clinically ill, or Iasymp for true asymptomatic), and recovered (R). We assumed that a proportion (p) of exposed cases will develop symptoms and that infectiousness can occur before the onset of symptoms. β is the rate at which persons become infected and move to E; exposed individuals become infectious at a rate σ and presymptomatic infectious cases develop symptoms at a rate σs; γasymp is the rate of recovery for asymptomatic persons; γs is the rate of recovery for symptomatic persons.

Main Article

1These senior authors contributed equally to this article.

Page created: December 14, 2020
Page updated: January 23, 2021
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