LISBON, Portugal — Portuguese authorities are requiring a negative test or proof of vaccination for people wanting to enter restaurants and hotels at peak periods in areas where the coronavirus is surging.

The government announced Thursday it wants people to use the EU Digital COVID Certificate to patronize such businesses on Friday evenings, weekends and public holidays.

The high-risk areas are mostly around the capital Lisbon and in the southern Algarve vacation region.

The certificates, which can be downloaded to an app, certify EU citizens’ tests and vaccinations. They also allow them to travel between countries without having to quarantine or be tested.

Portugal’s coronavirus 14-day incidence rate has risen to 255 per 100,000 people in recent weeks, pushed higher by the more infectious delta variant.