Tests in the wider Moscow region to see if people are carrying coronavirus antibodies suggest that as many as one in 10 residents may have been infected, a government project said on Friday.
The results, disclosed to Reuters by Moscow's International Medical Cluster, suggest that the novel coronavirus has spread more widely than the official tallies of confirmed infections.
Moscow and the Moscow region around it has reported 44,786 confirmed cases of the virus, suggesting 0.2% of the area's population of more than 20 million has been infected.