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Most common and rare side effects of Janssen covid vaccine, according to the CDC

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Aakash Molpariya
Aakash started in Nov 2018 as a writer at Revyuh.com. Since joining, as writer, he is mainly responsible for Software, Science, programming, system administration and the Technology ecosystem, but due to his versatility he is used for everything possible. He writes about topics ranging from AI to hardware to games, stands in front of and behind the camera, creates creative product images and much more. He is a trained IT systems engineer and has studied computer science. By the way, he is enthusiastic about his own small projects in game development, hardware-handicraft, digital art, gaming and music. Email: aakash (at) revyuh (dot) com

The Johnson & Johnson vaccine is the fourth coronavirus vaccine approved by the authorities after Pfizer, Moderna, and AstraZeneca. This vaccine, made by Johnson & Johnson’s pharmaceutical arm, Janssen, also differs from those already available as it is a single-dose vaccine, rather than requiring two separate shots.

Many studies suggest that it is 67 percent effective overall at preventing moderate to severe COVID-19 and offers complete protection from admission to hospital and death.

But like all vaccines, as highlighted by the CDC, it can also cause side effects.

And pain at the injection site (the muscle in the upper arm) including swelling and redness are the most common possible side effects among others.

Throughout the rest of the body, a person may have:

  • A headache
  • Tiredness
  • Muscle pain
  • Chills
  • Fever
  • Nausea

As stated by the agency, these side effects generally begin with a day or two of having the jab.

Although a person’s reaction to the jab may disturb their daily activities, such as feeling fatigued, the side effects should disappear within a few days.

It’s also possible for some people to faint after their injection if they’re prone to anxiety.

Other signs of anxiety might include rapid breathing, low blood pressure, numbness, or tingling in the body.

The CDC said that such a reaction is “uncommon”, but “not unexpected”, and such a side effect is “generally not serious”.

In the US there have been 653 reports of people either fainting or nearly fainting after having the Janssen Covid jab from March to April 2021.

To paint a clearer picture, there were nearly eight million doses of the Janssen jab given in the same time period.

The CDC clarified:

This translates to a rate of about eight fainting events for every 100,000 doses of the Janssen COVID-19 vaccine given.

All the fainting events occurred during the recommend 15-minute wait after vaccination.

It’s not clear at this time whether these events were associated with the vaccine or with anxiety.

In clinical trials, the Janssen Covid jab was 66.3 percent effective against the disease.

The vaccine had high efficacy at preventing hospitalisation and death in people who did get sick.

No one who got COVID-19 at least four weeks after receiving the Janssen vaccine had to be hospitalised.

As more “real-world” data is collected, the CDC will continue to update the public about the Covid vaccines.

Photo by Ulrich Baumgarten via Getty Images

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