A partial reopening of Danish schools did not lead to an increase in coronavirus infections among young students, a doctor of infectious disease epidemiology and prevention at the Danish Serum Institute said on Thursday, citing new data.

Denmark was one of the first countries to reopen society on April 15 after a one-month lockdown, allowing students up to fifth grade back in school.

“You cannot see any negative effects from the reopening of schools,” Peter Andersen told Reuters, referring to data updated on Wednesday.

The latest data showed no significant increase in infections among children aged between one and 19 in the weeks after the partial reopening of schools.

“Based on the preliminary experiences that we have had, it has been a prudent way to plan a reopening,” Andersen added.