After a day-long meeting Friday, an advisory panel for the US Food and Drug Administration voted 22 to 0 to recommend issuing an Emergency Use Authorization for Johnson & Johnson’s single-shot, refrigerator-stable COVID-19 vaccine.
If the FDA accepts the panel’s recommendation and grants the EUA—which it likely will—the country will have a third COVID-19 vaccine authorized for use. Earlier this week, FDA scientists released their review of the vaccine, endorsing authorization.
Agency watchers expect the FDA to move quickly on the decision, possibly granting the EUA as early as tomorrow, February 27. The FDA moved that fast in granting EUAs for the two previously authorized vaccines, the Moderna and Pfizer/BioNTech mRNA vaccines.
Additionally, an advisory panel for the Centers for Disease Control and Prevention that makes recommendations on vaccine use has scheduled an emergency meeting for this Sunday to discuss the vaccine’s use, further bolstering speculation that the federal government will move quickly to authorize and roll out the vaccine. If all of the pieces fall in line, doses of Johnson & Johnson’s COVID-19 vaccine could begin shipping out to vaccination sites early next week.
The rollout won’t be a big burst of new doses right away, though; it will likely be a slow roll. In congressional testimony this week, a Johnson & Johnson executive said that the company would provide 4 million doses after the EUA, with a total of 20 million ready by the end of March and a total of 100 million by the end of June. Still, with the vaccine only requiring a single-shot, those 100 million doses equate to 100 million people protected.
According to a detailed FDA review of Phase III clinical trial data submitted by Johnson & Johnson, the vaccine was 66 percent effective at preventing moderate to severe COVID-19 at 28 days after vaccination. (Johnson & Johnson defined moderate cases to include cases that had two symptoms, such as cough and fever, which would have been classified as simply “symptomatic” infections in other trials.)
The international trial, which involved over 44,000 participants in various trial sites, had different efficacies in different places. In the US, the overall efficacy was slightly higher, at 72 percent. But in places where variants of concern are widely circulating, the efficacy fell. It was 64 percent effective in South Africa, and 61 percent effective in Latin America.
Reassuringly, the efficacy against severe and critical disease was high across the board, in all the trial locations and across age groups. Efficacy against severe disease was 85 percent overall 28 days after vaccination. By location, efficacy against severe disease in the US was at 86 percent, 82 percent in South Africa, and 88 percent in Brazil. In a further analysis, there were zero hospitalizations among vaccinated participants and 16 in the placebo group. As of February 5, there were seven COVID-19-related deaths in the trial, all of which were in the placebo group.
In addition, Johnson & Johnson has a 30,000-person trial in progress testing whether adding a booster shot will further increase efficacy.
As for side effects, the vaccine has a “favorable safety profile,” according to the FDA. The most common side effects seen among the 44,000 or so participants were injection site pain (49 percent), headache (39 percent), fatigue (38 percent), and myalgia (33 percent). There were 15 cases of blood-clotting-related conditions among vaccinated participants, compared with 10 in the placebo group. There were also six cases of tinnitus (ringing in the ears) among the vaccinated and zero in the placebo group. It’s unclear if these conditions were related to the vaccine.
While anaphylaxis has been a rare but documented occurrence with the mRNA vaccines, it appears to be less of a risk with Johnson & Johnson’s vaccine. There was a single case of a severe hypersensitivity reaction two days after vaccination that was considered likely related to the vaccine. But the reaction was not classified as anaphylaxis.