A new study finds that giving a booster dose of the Johnson & Johnson COVID-19 vaccine six months after primary inoculation results in a nine-fold increase of a crucial antibody response, the company says.
Still, this new phase of the pandemic means federal health officials are now likely to endorse booster doses.
"We are prepared to offer booster shots for all Americans beginning the week of Sept. 20 and starting eight months after an individual’s second dose," said Centers for Disease Control and Prevention Director Rochelle Walensky, speaking at a press conference Wednesday. But the Biden administration's Wednesday announcement on booster doses only included people who received the Pfizer or Moderna shots, omitting a specific recommendation for those who received Johnson & Johnson. Walensky said data on Johnson & Johnson could be expected"in the next few weeks" and that"with those data in hand, we will keep the public informed with a timely plan for J&J booster shots as well.
Pfizer and Moderna vaccines were authorized in December 2020, while Johnson & Johnson was authorized in February 2021. Because large clinical trials for the Johnson & Johnson vaccine began months later than the other two vaccines, data for this vaccine often takes a few weeks longer to be published.
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