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NEW YORK — Federal officials are poised to OK an additional dose of coronavirus vaccine for people with weakened immune systems, according to the head of the Centers for Disease Control and Prevention said Thursday.

Dr. Rochelle Walensky says the U.S. Food and Drug Administration is considering allowing another dose for cancer patients, organ transplants recipients and other conditions.

A CDC expert advisory committee is scheduled to discuss the matter Friday, “following FDA’s decision,” according to Walensky.

Growing evidence suggests a benefit of an additional dose of vaccine for vulnerable people who have already received the two recommended doses of the Pfizer and Moderna shots. The FDA is working with the two companies to allow third shots for those patients who are most vulnerable to COVID-19, she says.

She stressed a small proportion of people would be eligible for the extra doses — less than 3% of adults.