ARDMORE, Okla. (KTEN) -- The Oklahoma State Department of Health has spent about two months giving COVID-19 vaccinations to first responders, health care workers, and the elderly.

Now it's time for them to add two new groups: Teachers and people with medical conditions that put them at high risk.

"So it's things like cancer, lung conditions, heart conditions, obesity, smoking… there's a list they can find if they go to register at vaccinate.oklahoma.gov," said health department regional spokeswoman Julie Williamson.

The newly qualified Oklahomans began rolling up their sleeves on Tuesday.

"There's been a lot of confusion, but our vaccination events are by appointment only; we do not allow walk-ins," Williamson said.

The US Department of Agriculture has approved some veterinarians to begin training for vaccine distribution, and two were at Tuesday's event in Ardmore.

Williamson noted that the state's online COVID-19 portal is not able to tell when each person needs their booster dose, so it's up to the individual to register at the right time.

She said people scheduling appointments need to be adults in order to get the vaccine. Williamson said they did have to turn away a minor who had signed up to receive a dose.