Covid-19 booster shot uptake is at all-time low in the US, CNN analysis finds

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Moderna vaccinates first participant in phase 2 trial of Omicron-specific booster as study finds that antibodies fall 6-fold over 6 months

A medical technician fills a syringe from a vial of the Moderna COVID-19 vaccine in Bates Memorial Baptist Church February 12, 2021 in Louisville, Kentucky.

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Moderna vaccinates first participant in phase 2 trial of Omicron-specific booster as study finds that antibodies fall 6-fold over 6 months

A vial of the Moderna Covid-19 vaccine and syringes sit prepared at a pop up vaccine clinic at the Jewish Community Center on April 16, 2021 in the Staten Island borough of New York City.

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Covid-19 vaccine booster effectiveness wanes after four months but still offers protection, study finds

A nurse prepares syringes with the Pfizer coronavirus booster vaccination on January 20 in Tokyo, Japan.

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Covid-19 booster shot uptake is at all-time low in the US, CNN analysis finds

The pace of people getting Covid-19 vaccine booster shots in the United States has reached a new low, and many public health experts are concerned.

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By Jacqueline Howard, CNN

The pace of people getting Covid-19 vaccine booster shots in the United States has dropped to the lowest it has ever been, and many public health experts are concerned.

CNN's Deidre McPhillips contributed to this report.