Research Article: Investigation on the possibility of dynamic COVID-Zero strategy in China: a population-based transmission model analysis and economic evaluation
Abstract:
Objective To explore the feasible and cost-effective intervention strategies to achieve the goal of dynamic COVID-Zero in China. Design A Susceptible–Exposed–Infectious–Recovered model combined economic evaluation was used to generate the number of infections, the time for dynamic COVID-Zero and calculate cost-effectiveness under different intervention strategies. The model simulated the 1 year spread of COVID-19 in mainland China after 100 initial infections were imported. Interventions According to close contact tracing degree from 80% to 100%, close contact tracing time from 2 days to 1 day, isolation time from 14 days to 7 days, scope of nucleic acid testing (NAT) from 10% to 100% and NAT frequency from weekly to every day, 720 scenarios were simulated. Outcome measure Cumulative number of infections (CI), social COVID-Zero duration (SCD), total cost (TC) and incremental cost-effectiveness ratio. Results 205 of 720 scenarios could achieve the total COVID-Zero since the first case was reported. The fastest and most cost-effective strategy was Scenario 680, in which all close contacts were traced within 1 day, the isolation time was 14 days and 10% of the national population was randomly checked for NAT every day. In Scenario 680, the CI was 280 (100 initial infections) and the SCD was 13 days. The TC was ¥4126 hundred million and the cost of reducing one infection was ¥47 470. However, when the close contact tracing time was 2 days and the degree of close contact tracing was 80%–90%, the SCD would double to 24–101 days and the TCs increased by ¥16 505 to 37 134 hundred million compared with Scenario 680. Conclusions If all close contact was controlled within 1 day, the rapid social COVID-Zero can be achieved effectively and cost-effectively. Therefore, the future prevention and control of emerging respiratory infectious diseases can focus on enhancing the ability of close contact tracing.
Introduction:
With the rapid mutation of SARS-CoV-2, global containment of COVID-19 has become increasingly difficult. Since the rampant epidemic of the Omicron variant, two different countermeasures have been highlighted in the international response to COVID-19 prevention and control. The USA, Canada, Britain and other countries 1–3 have cancelled COVID-19 prevention and control measures such as wearing masks, mass nucleic acid testing (NAT) and self-quarantine to prepare for long-term coexistence with the SARS-CoV-2…
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