Some people who showed up at the Meadowlands COVID-19 vaccine site on Thursday were surprised to find out that they would receive the one-shot Johnson & Johnson vaccine instead of the Pfizer shot.

The site was trying out the Johnson & Johnson vaccine for Thursday only. People scheduled for their first shot of the vaccine were given the J&J shot. Those who were there for a second dose of the Pfizer vaccine did receive one.

Some patients under the age of 18 had to reschedule their appointments because the Johnson & Johnson shot is not yet approved for minors.

But officials say that no appointments were canceled and no one was turned away if they wanted to go ahead to receive the J&J shot.

Officials say that this was a trial run.

“That is our main thing that we give here, is Pfizer. Johnson & Johnson, we’re just trying out. It’s just one day only for now until further notice,” says National Guard Sgt. Sidne Maldonado. “We don’t know if we’re going to be doing this every week.”

Maldonado says that people were asked at the door if they wanted to receive the one-shot J&J vaccine.

“It’s an option if you haven’t already gotten your first Pfizer dose,” he says.

There are now 1.9 million New Jersey residents who are fully vaccinated against COVID-19.