MADRID — Some regions in Spain are reinstating nightlife restrictions only weeks after dropping them, part of an attempt to stem a spiraling number of coronavirus infections among unvaccinated young people.

Fearing that the surging virus could strain healthcare services, health officials in several parts of the country are also hurrying to reach people under 30 with COVID-19 vaccines. Spain’s strict vaccination rollout has so far focused on older, more vulnerable groups.

On Friday, the 14-day contagion rate among those ages 20 to 29 years was nearly three times the national average.

The virus has also spread among teenagers as a result of trips and parties to celebrate the end of the school year.