Epidemic Forecasting Models Overestimated Potential Infection Numbers Amid COVID-19 Lockdown Debate

The Imperial College London’s model predicted 40 million deaths in the first year of COVID-19 while the real count is 6.9 million deaths altogether.
Epidemic Forecasting Models Overestimated Potential Infection Numbers Amid COVID-19 Lockdown Debate
A worker sits next to a fence close to a residential area during the COVID-19 lockdown in the Huangpu district of Shanghai on June 10, 2022. Hector Retamal /AFP via Getty Images
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A new study has shown that flawed epidemic modeling techniques can lead to overestimating the number of people who could get infected during a pandemic—resulting in unnecessary measures such as lockdowns and mass vaccination campaigns.

The peer-reviewed study, published in the Journal of Physics Complexity on Jan. 9, associated existing models of forecasting epidemics with the structure of social networks among people. The most widely used forecasting method is a “compartmental model,” which usually makes an assumption of “random mixing,” meaning that any individual can infect any other person. However, this is a flawed assumption that can lead to “greatly overestimating the number of infections,” the study pointed out.
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