Masks good, ventilation better at cutting COVID risk at indoor events - study

FILE PHOTO: Drummer Christian Bluem of the band Brings from Cologne wears a protective face mask before a concert in a drive-in cinema, as the spread of the coronavirus disease (COVID-19) continues in Cologne, Germany, April 17, 2020. REUTERS/Thilo Schmuelgen/File Photo

BERLIN (Reuters) - Face masks and limits on numbers are important, but good ventilation technology is the most essential ingredient of all in reducing the risk of the coronavirus spreading at public events indoors, according to a German study.

And researchers say the study's results have implications for containing the epidemic among the broader population too.