In two clinical studies that have not yet been peer-reviewed, the additional Johnson & Johnson vaccine shot evoked a nine-fold increase in antibodies to the coronavirus, the company said in a news release.
Washington, United States - Johnson & Johnson said Wednesday a second dose of its Covid-19 vaccine boosted immunity beyond the first dose.
In two clinical studies that have not yet been peer-reviewed, the additional shot evoked a nine-fold increase in antibodies to the coronavirus, the company said in a news release. President Joe Biden's administration has announced plans for all Americans vaccinated with mRNA vaccines - Pfizer and Moderna - to receive a third dose eight months after the second in the series.
The Centers for Disease Control and Prevention has said it expects a second dose of the J&J vaccine will be required, but that it needs more data before making a firm recommendation. Wednesday's announcement will likely help inform that strategy. The company's news release did not specify when the second dose was taken, but information about the trials on government websites shows the company was testing multiple intervals, beginning at six months.
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