A committee of US medical experts voted unanimously on Friday to recommend authorization of a second dose of Johnson & Johnson’s Covid-19 vaccine. This recommendation applies to anyone over the age of 18 who received a first dose of the vaccine at least two months ago.
Members of the committee, brought together by the US Medicines Agency, the FDA, agreed that the evidence for safety and efficacy was in the direction of injecting a second dose, as claimed by the pharmaceutical giant.
The recommendation may be changed later by the FDA, as well as the CDC, the principal federal health agency in the United States. An emergency authorization could intervene in the days or weeks to come.
Several of these independent experts have suggested that if Johnson & Johnson has applied for authorization of a booster dose, a second vaccine should actually be considered an “extra” dose, necessary to achieve a more complete vaccination.
The “J&J” single-dose remedy has not been shown to be as effective as the two-dose messenger RNA vaccines. But some data suggests that it is less likely to subside over time than vaccines from Pfizer and Moderna, due to its virus-vector technology.
Johnson & Johnson presented their study, conducted in the United States, showing that the efficacy of its vaccine against symptomatic forms of Covid was increased by 70 to 94% after the injection of a second dose, two months after the first, similar figures to those of messenger RNA vaccines.
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