New York City Mayor Bill de Blasio signed an executive order mandating that hotels and other rental companies hosting visitors from restricted states sign a quarantine form before granting them access to rooms.

“This is going to be now a rule here in New York City because we have to get serious about the fact that there’s a real danger here,” de Blasio said Tuesday. “We have to confront it [and] we have the right tool to confront it, which is the quarantine, but now, people have to take that seriously. So this executive order would be another step to make clear to everyone how serious it is.”