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WASHINGTON– In yet another obstacle for Johnson & & Johnson’s coronavirus vaccine, the Food and Drug Administration on Thursday limited its use to grownups who can not or refuse to get the Pfizer-BioNTech or Moderna vaccines, mentioning security concerns.

The agency stated 60 cases of a uncommon however severe blood-clotting disorder have been recognized, including 9 deaths, out of about 18 million doses administered. The action comes about five months after the Centers for Disease Control and Prevention suggested Moderna’s and Pfizer’s vaccines over Johnson & & Johnson’s for booster shots.

The F.D.A. said that weighing the risks of Johnson & & Johnson’s vaccine versus the benefits, it had actually decided to restrict its use to grownups who can not access Pfizer’s or Moderna’s vaccines, or for whom those shots are not “medically proper.” One example would be people who experienced a severe allergy to the other two vaccines, the company said.

It said the vaccine might also be provided to adults who “would otherwise not receive a Covid-19 vaccine.”

Johnson & & Johnson was eclipsed long earlier by Pfizer and Moderna in the nation’s vaccination project; federal officials have said the mRNA vaccines produced by those business are both much safer and more effective. In a declaration, Johnson & & Johnson said the F.D.A.’s action reflected the already-known threat of the negative effects, not brand-new data on the rate at which it happens. But in a sign of the firm’s own flagging interest in its vaccine, it has stopped providing sales outlooks for the shot to financiers.

Reports that the vaccine can activate a condition referred to as thrombosis with thrombocytopenia syndrome have bedeviled it from early on. In April 2021, not long after it was authorized for emergency use, federal authorities stopped briefly circulation of the vaccine for a safety assessment. Regulators lifted the time out 10 days later however included a warning to instructions for its use.

Then, in December, the C.D.C. recommended that grownups seeking a booster shot pick Moderna or Pfizer instead of Johnson & & Johnson, pointing out more advantages and lower dangers. Paired with a host of making problems in the United States, some experts said, the company’s judgment showed that the federal government had all however written off Johnson & & Johnson’s vaccine.

According to the F.D.A. statement on Thursday, federal authorities now have 60 reports of the blood-clotting condition– or four times as numerous as were reported when last year’s pause in circulation was lifted. In the interim, the variety of Johnson & & Johnson dosages administered has a little more than doubled, while the number of Pfizer and Moderna receivers has actually skyrocketed.

The number of deaths attributed to the condition triggered by the Johnson & & Johnson’s vaccine does not appear to have actually risen much, if at all. But there have actually been far less, if any, thought deaths due to negative effects from the mRNA vaccines, federal health authorities have said.

In its announcement, the F.D.A. pointed out more than six cases and near one death credited to the blood-clotting disorder for every 2 million shots of Johnson & & Johnson vaccine administered in the United States.

About 17 million Americans have actually now gotten one dose of Johnson & & Johnson’s vaccine, and another 1.5 million have actually gotten a booster dose, according to the C.D.C.’s information. By contrast, more than 200 million Americans have actually gotten at least 2 dosages of either Moderna’s or Pfizer’s vaccine.

Attempting to cast the tight new restrictions in a favorable light, Johnson & & Johnson stated: “Data continue to support a beneficial benefit-risk profile for the Johnson & & Johnson COVID-19 vaccine in adults, when compared to no vaccine.”