BATON ROUGE, La. (AP) — The Louisiana Department of Health is making COVID-19 vaccine booster shots available for some people with weak immune systems that put them at high risk for COVID-19.

The department said in a news release Friday that it’s following guidelines released late Thursday by the federal Centers for Disease Control and Prevention. The CDC endorsed a third dose of the Pfizer or Moderna vaccine for people whose immune systems have been weakened by cancer treatment, organ transplants or other conditions.

Such people are estimated to make up at most 3% of the U.S. population.

The announcements came as the extra-contagious delta version of the coronavirus is setting pandemic records in Louisiana and pushing new cases, hospitalizations and deaths nationwide to heights not seen since last winter.ADVERTISEMENT

A form with checkboxes for the type of immune system problem is available on the state health department’s website.

People with moderately or severely compromised immune systems can fill out the form on their own to get a third shot, without a doctor’s signature. The third shot should be given at least 28 days after their second Pfizer or Moderna shot, the department said.

It also has asked vaccine providers to have these forms available for patients to complete.

“People should talk to their healthcare provider about their medical condition, and whether getting an additional dose is appropriate for them,” the department said.