U.S. company Johnson & Johnson on Sept. 23 announced it has reached phase three clinical trials for its COVID-19 vaccine candidate, becoming the fourth manufacturer to reach this phase in clinical trials amid a pandemic.
Johnson & Johnson (J&J) is pursuing a single-shot vaccine in its latest trial. Its three rival manufacturers are currently testing vaccines that would require two shots, separated by several weeks.
President Donald Trump said at a press conference on Sept. 23 that J&J is “far ahead of schedule,” as the company had initially expected to only reach phase one trials by September.
“We encourage Americans to enroll in the vaccine trial. It’s not only interesting; it'll be a terrific thing for our country. We encourage everybody to enroll, as many people as we can,” Trump said.
The J&J vaccine is being developed by the company’s Janssen Pharmaceutical Companies.
He told reporters at a joint news conference that J&J expects results by late 2020 or early 2021, and that if all goes well, the company plans to manufacture as many as 1 billion doses in 2021 and more after that.
He said in the conference, attended by officials from the National Institutes of Health and the Trump administration, that the single-dose version would be “very important for emergency use” and that J&J will later test a booster dose that the company hopes could produce even greater immunity to the virus.
The company is set to enroll some 60,000 volunteer participants across three continents—the largest trial compared to the other three manufacturers that have reached phase three.
“Countries and clinical trial sites which have a high incidence of COVID-19 and the ability to achieve a rapid initiation will be activated,” it said.
Stoffels said it will take about six weeks to two months to have enough participants in the vaccine trial.
J&J’s trial would be considered a success if it proves to be 60 percent effective, with a study protocol that could have an efficacy answer after 154 people became infected with the virus.
“The benefits of a single-shot vaccine are potentially profound in terms of mass immunization campaigns and global pandemic control,” Dr. Dan Barouch, a Harvard vaccine researcher who helped design the vaccine candidate, told Reuters.
In August, J&J had signed an agreement with the British government on a global phase three clinical trial to study a two-dose version of its vaccine, which will run in parallel with the single-dose trial.
“We feel cautiously optimistic that we will be able to have a safe and effective vaccine, although there is never a guarantee of that,” he said.
“A typical vaccine takes roughly four years or so, and now we’re going to have a vaccine, highly likely, in far less than 1 year, but without cutting any safety corners because the president has done things concomitant to the development of the vaccine—that is, the manufacturing and the logistics,” Atlas said. “Everything is being done at the same time, and that’s never been done before.”
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