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J&J says booster shot raises antibody levels 9-fold

FILE - In this March 6, 2021, file photo, boxes stand next vials of Johnson & Johnson COVID-19 vaccine in the pharmacy of National Jewish Hospital for distribution in east Denver. (AP Photo/David Zalubowski, File) (David Zalubowski, Copyright 2021 The Associated Press. All rights reserved.)

Johnson & Johnson announced Wednesday that new data supports that use of its COVID-19 vaccine as a booster shot for those previously vaccinated with the single-dose vaccine raises antibody levels 9-fold higher than 28 days after the first vaccination.

According to the company, “significant increases in binding antibody responses were observed in participants between ages 18 and 55, and in those 65 years and older who received a lower booster dose.”

“We have established that a single shot of our COVID-19 vaccine generates strong and robust immune responses that are durable and persistent through eight months. With these new data, we also see that a booster dose of the Johnson & Johnson COVID-19 vaccine further increases antibody responses among study participants who had previously received our vaccine,” said Mathai Mammen, M.D., Ph.D., Global Head, Janssen Research & Development, Johnson & Johnson. “We look forward to discussing with public health officials a potential strategy for our Johnson & Johnson COVID-19 vaccine, boosting eight months or longer after the primary single-dose vaccination.”

The announcement comes two days after U.S. regulators gave full approval to Pfizer’s COVID-19 vaccine.

Just over half of the U.S. population is fully vaccinated. Vaccinations in this country bottomed out in July at an average of about a half-million shots per day, down from a peak of 3.4 million a day in mid-April. As the delta variant fills hospital beds, shots are on the rise again, with a million a day given last Thursday, Friday and Saturday.


About the Author:

Amanda Batchelor is the managing editor for Local10.com.