MADRID — Three counties in northern Spain have reimposed lockdown measures after coronavirus infections spiked among workers handling fruits and vegetables at a warehouse.

Authorities in the Aragon region have limited public activity and recommended limited mobility in several towns after recording 33 infections, most of them tied to the warehouse where some 200 workers are being tested.

The region’s top public health official said Monday that authorities are confident they can control the outbreak at an early stage: “We identify cases because we are looking for them,” said Francisco Javier Falo.

The official said that most of those infected are young and had either no symptoms or showed very mild forms of the COVID-19 disease.

Monday is Spain’s first working day after leaving behind a 98-day lockdown that ended over the weekend, with some restrictions remaining on public transportation, venue capacity and large-scale gatherings.

Since early March, Spain has recorded more than 246,000 infections and over 28,300 deaths for the new virus.