J&J shot alert: Get it again!

Experts are urging those who received the Johnson & Johnson vaccine to get the booster shot as soon as possible after a new study showed a drop in its effectiveness during the Delta variant surge.

An FDA advisory committee unanimously endorsed the emergency authorization of the J&J booster Friday.

“J&J is a very good vaccine. I also believe it’s probably a two-shot vaccine,” Dr. Ashish Jha, dean of the Brown University School of Public Health, told CNN. “It’s really urgent that people get that second shot pretty quickly.”

A study published Thursday that is yet to be peer-reviewed analyzed 620,000 military veterans who received the J&J vaccine this year and found that effective protection fell precipitously from 88 percent in March to just 3 percent in August.