About 1.8 million people living in Germany must have been infected, more than 10 times the number of about 160,000 confirmed cases so far, the team led by medical researchers Hendrik Streeck and Gunther Hartmann concluded.
“The results can help to further improve the models to calculate how the virus spreads. So far the underlying data has been relatively weak,” Hartmann said in a statement.
The team analysed blood and nasal swabs from a random sample of 919 people living in a town in the municipality of Heinsberg on the Dutch border, which had among the highest death tolls in Germany.