BATON ROUGE, La. (AP) — The Louisiana Department of Health is making COVID-19 vaccine booster shots available for people with weak immune systems who have had both Pfizer or Moderna shots. The department said in a news release Friday that it’s following guidelines released by the federal Centers for Disease Control and Prevention. A form with checkboxes for the type of immune system problem is available on the department’s website. People with a filled-out form can get a third shot at least 28 days after their second Pfizer or Moderna shot. They don’t need a doctor’s signature. But the department says people should talk with their health providers about whether a third dose is a good idea.