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Federal authorities on Tuesday recommended that states stop using Johnson & Johnson’s Covid-19 vaccine while an investigation is conducted into six serious cases of clotting problems — one of which was fatal — that were reported among women who received the vaccine.

The blood clots are similar to those reported by several European countries after use of AstraZeneca’s Covid-19 vaccine. And they are similar to an event that occurred during Johnson & Johnson’s U.S.-based clinical trial, an event that led to a temporary pause in that trial last fall. That case involved a man in his 20s, STAT reported at the time.

The clotting problem appears to be quite rare. As of Monday, more than 6.8 million doses of the Johnson & Johnson vaccine had been administered in this country. But officials acknowledged the investigation — and increased use of the vaccine, which was shipped in record numbers last week — could lead to the discovery of more cases.

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The concern over Johnson & Johnson’s vaccine is raising questions about whether there is what’s known as a “class effect” — a problem one would expect to see with all vaccines made in the way the J&J and AstraZeneca vaccines are made. The Sputnik V vaccine, made by Russia’s Gamaleya Research Institute and the vaccine made by CanSino, a Chinese manufacturer, are made in the same way as the Johnson & Johnson and AstraZeneca vaccines.

The four vaccines use modified adenoviruses — viruses that cause colds — to deliver instructions to human cells to make the SARS-CoV-2 spike protein, the exterior proteins that allow SARS-2 viruses to attach to and invade cells. Those vaccine-induced spike proteins teach the immune system to look out for and defend against SARS-2 viruses.

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Theories about the cause of the rare clotting issues hinge on the possibility that, in small numbers of people, the adenoviruses trigger an aberrant immune response. That, in turn, results in a rare combination of widespread clotting and low platelet counts.

Top officials of the Food and Drug Administration and the Center for Disease Control and Prevention stressed during a press conference Tuesday that clotting problems have not been seen with the vaccines made by Moderna and the Pfizer-BioNTech partnership. Roughly 180 million doses of those vaccines have been given so far in the country.

Peter Marks, director of the FDA’s Center for Biologics Evaluation and Research, skirted around the term “class effect” but suggested the fact that the problem was also seen with the AstraZeneca vaccine underscored for the FDA and CDC that the events might be linked to vaccination.

“I hesitate to call it a class effect,” Marks said. “But I think it is plainly obvious to us already that what we’re seeing with the Janssen vaccine looks very similar to what was being seen with the AstraZeneca vaccine.”

Janssen is the name of Johnson and Johnson’s vaccines division.

The CDC and the FDA jointly conduct surveillance for adverse events that might be linked to use of vaccines; the two agencies jointly announced the recommendation that use of the vaccine be paused. The move falls short of an order not to use the vaccine and Marks acknowledged that it may continue to be used in some cases, if a provider and a patient discuss the risks and benefits and decide to proceed with vaccination.

The CDC’s Advisory Committee on Immunization Practices, which advises the public health agency on vaccine uses, is holding a special meeting Wednesday to review the J&J data. It is conceivable that the panel of outside experts will suggest that use of the vaccine be continued, but with some restrictions on who should get this vaccine. A number of other countries in Europe and elsewhere have already imposed such limits on use of the AstraZeneca vaccine. That vaccine has not been authorized in the United States.

The FDA and CDC officials stressed the decision to pause use of the J&J vaccine was made “out of an abundance of caution.” Key to the decision was recognition of the need to inform health care providers to be on the lookout for people who might be having one of these reactions so that they can avoid giving care that could make the situation worse.

“The issue here with these types of blood clots, is that if one administers the standard treatments that we as doctors have learned to give for blood clots, one can actually cause tremendous harm or the outcome can be fatal,” Marks said. “One needs to make sure that providers are aware that if they see people who have low blood platelets, or if they see people who have blood clots, they need to inquire about the history of recent vaccination, and then act accordingly.”

In a statement, Johnson & Johnson said it is working closely with health authorities and medical experts to investigate the issue. It also announced it would delay the rollout of its vaccine in Europe.

Neither the statement from the agencies nor the statement from the company referenced the status of Johnson & Johnson’s ongoing clinical trial in the United States that is testing its vaccine in a two-dose regimen. The vaccine is currently authorized for use in a single dose.

When asked if the company has been asked to pause the trial, Marks said statements from the company would address voluntary actions the company is taking. J&J did not immediately respond to a request for comment from STAT.

The blood clots reported in the six cases are known as cerebral venous sinus thrombosis (CVST); in all cases, the clots were seen in combination with low levels of blood platelets, a condition known as thrombocytopenia. All occurred among women between the ages of 18 and 48, the statement from the CDC and FDA said, and symptoms occurred between six and 13 days after vaccination. In addition to the fatal case, one of the women is in critical condition.

Experts applauded the decision as the right thing to do.

“The pause is a prudent step to take, because when very serious adverse events occur that are also very rare, what matters most is ‘very serious,’” said John Moore, an immunologist at Weill Cornell Medicine. “Not only are individual members of the public at some risk, but so is the wider confidence in the Covid-19 vaccines.”

“It’s a reasonable but unproven assumption that the J&J and AstraZeneca vaccine safety concerns are linked by being related to an immune response against an adenovirus component,” he said. “So, FDA and scientists need time to better understand what is going on, which means a pause is the right course of action.”

But another expert acknowledged that the news may threaten the vaccine’s future use in this country.

“You have a greater chance of being in a car accident on the way to getting this vaccine than you have of having a problem from this vaccine. But that’s not how people view risk,” said Paul Offit, a vaccine expert at Philadelphia Children’s Hospital.

“In this country, you have two other vaccines, which are likely going to be produced in a quantity that enables everyone to be vaccinated,” he said. “So I think as we get more and more of the Moderna and Pfizer vaccine out there … I think it would not be surprising if … this vaccine would not come back onto the market.”

Offit was on the advisory panel that recommended the FDA authorize use of Johnson & Johnson’s vaccine.

The CDC and FDA said people who have received the Johnson & Johnson vaccine who develop certain symptoms within three weeks of receiving the vaccine should contact their health care provider. The symptoms were listed as severe headache, abdominal pain, leg pain, or shortness of breath.

The investigation into the Johnson & Johnson vaccine comes at a critical time for the Covid-19 vaccine rollout. Vaccine supplies that were scarce earlier in the year are starting to swell; rather than long lines, some jurisdictions are starting to report having unclaimed shots.

That had been expected. It has been known that behind the hordes desperate to be vaccinated was some significant portion of people who were worried about getting newly developed vaccines as well as some who will refuse vaccine under all circumstances. Persuading the former to get vaccinated in the face of a reports of a potential link between some of the Covid vaccines and a serious side effect will increase the challenge.

That said, vaccination with the AstraZeneca vaccine continues in many countries, though a number have placed limits on who can receive the vaccine — reserving its use for older adults, in whom these events have not been reported.

In Europe, where the AstraZeneca vaccine is being widely used, at least 222 suspected cases have been reported among 34 million people who have received the vaccine, according to a news report in the journal Science.

  • Reading your story about the Johnson and Johnson shot, it’s very scary I just got that shot on the 9th. Now, I’m concerned about the situation and side effects. Thank you for your article.

  • I had this Vaccine 5-6 days ago. April 9th, it presented me with sickness ,Flu symptoms, 100.4 fever over 24 hours nxt day I bounced back as I’m healthy and Active.
    Im under the 13 days for possible blood clots formation !?!?!? What the f?
    But I’m age 63 female post menopausal
    But have a history of MPD myeloproliferative blood disorder.
    I’m upset and Angry that this blood clotting factors in the vaccine were undermined, and not disclosed of to the General PUBLIC before a big Rollout.
    Thats”s it ,will be my last ever vaccine I will not trust again.
    I worked ENTIRE Pandemic and have Not ever Tested positive for Virus.
    And Now I see the News today…
    It’s a Medical Crime. Someone will Pay.

    • These extremely rare incidents are occuring at a rate of roughly 1 in a million in the case of J&J.

      The trials were only c44,000 people of which half got placebo.

      No way you can pick up that signal.

      The only way it can be picked up is in phase 4. I.e. During rollout when MILLIONS get a dose. Which is exactly what has happened. What more do you want?

      By the way the polio vaccine killed 1 in a million (roughly what AZ is doing and many times J&J). Nobody accuses the developers of a medical crime (whatever the hell that is). They laud them for saving MILLIONS from death and permanent disability!

  • My husband and I both had the Jensen vaccine! We are 60 and 69. How concerned should we be. We were given the shot on 03/19/21. No side effects so far.

  • Do we know if the adenovirus vector vaccines by Gamaleya and CanSino show blood clotting too? If the clotting is mostly seen in women of “productive” or almost menopausal age : is there a hormonal link? Are / were they on systemic contraceptives (i.e. the Pill)? Is (ovario) hysterectomy a possible link? Is the gender chromosomal helix a link (2 X for female, 1 for male)? What other gender-specific clotting-related diseases might provide a clue? With so many un-answered questions – the FDA is wise to pause use of some vaccines when other vaccines have fewer complications.

    • Peter Stuart B Has pointed out a good clue. Another possibility that I was thinking, similar to Peter Stuart B, was the HPV vaccination and its reaction the modified adenovirus. Not the mRNA of course since the mRNA is the same as Modern and Pfizer (BioNTech).

  • I’m not against a vaccine, whats bothersome to me is 18 of the 86 cases of blood clots from vaccines in Europe were fatal and it is being downplayed….when it comes to the virus ” One death is one too many”, but with the vaccine…meh, its only a 1 in 1,000,000 chance you’ll get a deadly blood clot. So far 19 of the 92 reported cases between the US and Europe have been fatal, with one more in the US in critical care…almost 20 people are dead because of this 1:1,000,000 chance. They would have had a better chance of surviving the virus (if they would have even contracted it)…but since we are being pushed to hurry up and get this, I’m sure they felt like they were doing the right thing “for the benefit of others” ( even though they went an entire year with out contracting or passing it to others) …now they’re dead, directly b/c of these vaccines.

    • Stop being ridiculous. 4,000 people a day are dying in Europe of COVID-19. Even if you vaccinated every adult there (c600m) and killed 600 you would kill 15% of the people COVID-19 is killing PER DAY!

  • The type of vaccine such as J&J and AstraZeneca have clotting and stroke issues. Although relatively rare, this is a common problem for adenovirus based Covid vaccines. J&J also caused a few fainting cases.

    The even bigger problem is their efficacy. J&J did not count the “milder” Covid cases which often led to long covid neurological problems, etc. Counting these cases, the efficacy is most likely only ~60%.

    Moderna, Biontech, CureVac and Novavax are clearly superior in both efficacy (>90%) and safety. The much higher antibody levels also made them potent against the variants.

    • Should I be concerned if I’m post menopausal 63 female had this J&J Vaccine 5 -6 days ago ?
      I have history :mild MPD myeloproliferative blood “high platelets” But had that since age 45.

      I worked entire Pandemic and have not been sick.

  • Interesting, if you look at the CDC’s VAERS (adverse effects reporting system), this problem is quite larger than this article, and others topping Google’s search results, are letting us know. Especially when you consider that the CDC states that only an estimated 10 of such events are reported.

  • They need to stop vaccinating premenopausal women with the adenoviral vaccines. The younger female immune system is hyper-responsive to these vectors.

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