Meat giant Danish Crown announced on Saturday that it had closed a large slaughterhouse in Denmark after nearly 150 employees tested positive for coronavirus.

The abattoir in Ringsted, about 30 miles from the capital Copenhagen, employs nearly 900 people and slaughters tens of thousands of pigs every week.

Danish Crown said 120 employees tested positive in a first round of tests of 600 employees.

It retested all the negative cases and detected 22 additional infections.

“For this reason, we are closing the abattoir for at least a week to try to break the chain of transmission among employees on site,” Danish Crown said.

All the employees must quarantine.

The company is one of Denmark’s biggest exporters and the biggest pork-product producer in Europe.

Several European slaughterhouses have been hit with the virus in recent months, particularly in Germany.

The virus cluster at Ringsted is the main active one in Denmark, where the number of cases has increased sharply in recent days.

The resurgence has forced the government to abandon plans to ease restrictions at concert halls and nightclubs, and instead prepare new curbs.

Several dozen infections have been registered in Aarhus, the country’s second-biggest city.

Prime Minister Mette Frederiksen said on Friday that Denmark intends to make masks compulsory on public transport.