Israel has reported more than 6,000 new coronavirus infections, the highest daily increase since February.

Israel rolled out one of the world’s most successful vaccination campaigns starting late last year, but in recent weeks has been battling a surge in new cases driven by the highly contagious delta variant.

Authorities have ramped up travel restrictions and restored mask mandates for indoor settings.

More than 85% of Israel’s adult population has been fully vaccinated, and authorities are now calling on those over 60 to get a third dose. The Health Ministry says 577,899 people have received a booster shot.

The ministry recorded 6,275 new confirmed cases on Monday, with 4.84% testing positive out of more than 130,000 tests. Data released by the Israeli government shows the unvaccinated, especially those over 60, are far more likely to become seriously ill.