The number of confirmed cases for the novel coronavirus disease COVID-19 officially issued by countries and widely reported by national and international media outlets dramatically understates the true number of infections, according to a recent report from the University of Göttingen. Dr. Christian Bommer and Professor Sebastian Vollmer from Göttingen University have used estimates of COVID-19 mortality and time until death from a recent study published in The Lancet Infectious Diseases to test the quality of official case records. Their data shows that countries have only discovered on average about 6% of coronavirus infections and the true number of infected people worldwide may already have reached several tens of millions. Their study is available online.

Insufficient and delayed testing may explain why some European countries, such as Italy and Spain, are experiencing much higher casualty numbers (relative to reported confirmed cases) than Germany, which has detected an estimated 15.6% of infections compared to only 3.5% in Italy or 1.7% in Spain. Detection rates are even lower in the United States (1.6%) and the United Kingdom (1.2%)—two countries that have received widespread criticism from public health experts for their delayed response to the pandemic.

In sharp contrast to this, South Korea appears to have discovered almost half of all its SARS-CoV-2 infections. The authors estimate that on 31 March 2020, Germany had 460,000 infections. Based on the same method, they calculate that the United States had more than 10 million, Spain more than 5 million, Italy around 3 million and the United Kingdom around 2 million infections. On the same day, Johns Hopkins University reported that globally, there were fewer than 900,000 confirmed cases, meaning that the vast majority of infections were undetected.

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