As expected, a C.D.C. panel of experts endorsed the Johnson & Johnson vaccine.

A committee of expert advisers to the Centers for Disease Control and Prevention voted as expected on Sunday afternoon to recommend distribution of the Johnson & Johnson vaccine to all adults in the United States.

The committee’s approval echoed the Food & Drug Administration’s decision Saturday evening to authorize the vaccine for emergency use. It is the third Covid-19 vaccine to be authorized for Americans in less than a year. The first shipments are expected to reach states by Tuesday.

The committee did not weigh in on whether states should prioritize the one-shot vaccine for any particular population groups, or how they should deploy it compared with the other two authorized vaccines.

“That is not a decision that we’re ready to make,” said Dr. José Romero, Arkansas’s top health official and the committee’s chair.

The panel voted 12 in favor of the vaccine and none against, with one recusal.

The committee acted with little debate following presentations showing the vaccine was 85 percent protective against severe Covid-19 disease across all clinical trial sites and provided complete protection against hospitalizations and deaths.

Experts pointed out that the Johnson & Johnson vaccine will be simpler to distribute than the other two vaccines, which are made by Moderna and Pfizer with its German partner BioNTech. It requires just one shot instead of two and can be stored in standard refrigerators instead of freezers. Health professionals have noted that it could be particularly well-suited to remote areas and clinics as well as drive-through mass vaccination sites.

The committee weighed those advantages against the shot’s somewhat lower efficacy rate in clinical trials. Pfizer and Moderna’s shots each were shown to be about 95 percent protective against symptomatic Covid disease, whereas Johnson & Johnson’s was 72 percent efficacious against moderate to severe disease in U.S. trial sites.

Direct comparisons between the vaccines are problematic, however, because the trials were conducted in different locations at different times. For instance, Pfizer’s and Moderna’s vaccines were tested before troubling new variants of the virus emerged in Britain, South Africa and elsewhere.

The panel, the Advisory Committee on Immunization Practices, reviewed one recent survey showing that, given a choice between a two-dose vaccine as effective as Pfizer’s or Moderna’s or a single dose vaccine as effective as Johnson & Johnson’s, only 7 percent of respondents picked Johnson & Johnson’s. Twenty-one percent said they would take either.

Importantly, though, of the 58 percent of respondents who said they preferred a vaccine like Pfizer’s or Moderna’s, nearly half said they would take a vaccine like Johnson & Johnson’s rather than wait a month for one of the other two.

The committee met almost exactly one year after the first death associated with Covid-19 in the United States. The committee is expected to meet again on Monday and discuss all three vaccines, including how they might be best deployed among different population groups.

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