Doctors on Long Island are reminding people that just because you are fully vaccinated doesn't mean you can't get COVID-19, saying to understand that the Centers for Disease Control and Prevention's mask guidance is only a recommendation.

The CDC announced Thursday that if you're fully vaccinated, you no longer need to wear a mask in most places. That guidance now needs approval from Gov. Andrew Cuomo to become policy in New York.

MORE: What you need to know about 'breakthrough' COVID-19 cases
MORE: Cuomo says NY 'reviewing' new CDC mask guidelines; no decision yet

Doctors say fully vaccinated people can also still spread the virus.

"If you're with family and friends and you know them and you know that they have or have not been vaccinated and they're following the guidance, I think you're in great shape," says Dr. Sharon Nachman, with Stony Brook Hospital. "If you're going to a large, crowd-filled area and you really don't know anything about those people I would say proceed with caution."

Dr. Mark Jarrett, chief quality control officer with Northwell Health, says he thinks a degree of caution is still beneficial at this point.

Doctors also say that people with comorbidities who have been fully vaccinated should talk to their doctor before deciding to stop wearing a mask in a crowd.