Just SIX in 1 million people develop rare heart inflammation after a second dose of the Covid vaccine – 85% less than the rate among the unvaccinated, study finds 

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  • Less than one in every million people develop myocarditis after the first shot of a COVID vaccine, and about six develop it after the second jab.
  • Non-vaccinated participants found to be eight times more likely to develop heart failure swelling in the form of people who get the shot
  • All participants who developed the condition after vaccination were men, and officials have warned that young men are more vulnerable to heart disease.
  • The CDC reports that only 1,500 out of every one million Covid patients hospitalized have myocarditis.

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Americans are more likely to develop a rare heart inflammation after a second dose of the COVID-19 vaccine than after the first dose, a new study suggests.

Researchers at Kaiser Permanente Southern California (KPSC) found that one in every million people who received the first dose of Pfizer-BioNTech, or Moderna Vaccine, would develop the condition within the next ten days.


By comparison, six out of every million will develop heartburn within ten days of the second dose.

But unaffiliated people are still at much higher risk.

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The team found that 47.5 out of every one million people who had not had their shots and health checkups were in poor condition.

The findings suggest that myocarditis is a rare side effect of the vaccine, and that people should feel safe receiving Jabs.

People who received the COVID vaccine were seven times more likely to develop heart inflammation after the second dose of the jab than the first. However, people who have not been vaccinated have a significantly higher chance of developing myocarditis.

Myocarditis, the medical name for inflammation of the heart, is a known side effect of viral infections such as COVID.

The condition has also been explored as a possible side effect of vaccines, with young men at particularly high risk, but at a much lower rate than those of contracting the virus.

for study. published in JAMA Internal Medicine on Monday, the KPSC team collected data from more than 2.3 million patients in its Southern California health care system.

Researchers examined participants’ medical records to find out who had received medical care for myocarditis in the ten days following the jab.

Two participants were found to have developed myocarditis after receiving the first shot, or 0.8 out of every million people.

By comparison, more than 2.2 million participants returned for screening after the second shot, of whom 13 — or 5.8 out of every million — had the condition.

This means that people are seven times more likely to develop the condition after the second dose rather than the first.

Those who developed the condition were split evenly between participants who received the Pfizer and Moderna shots.

For a control group, the researchers also collected data from 1.5 million illiterate people during the study period.

It was found that about 47.5 out of every million people did not develop the condition.

While those in the control group were not specifically selected because they had previously contracted the virus, it is likely that Covid caused the condition in unvaccinated people.

This means that unvaccinated people are eight times as likely to develop myocarditis after receiving the vaccination, compared with people.

Each participant in the study who developed heart inflammation after receiving the vaccine was a male.

This is a known trend with the Centers for Disease Control and Convention (CDC). Warning that young men are particularly vulnerable to myocarditis after receiving the vaccine.

a Gallup poll It was found since late July that fear of side effects – of which the most common serious side effect is myocarditis – is the most cited reason for vaccine hesitation.

This KPSC study suggests that people who get jabs are more likely to experience these negative side effects than people who don’t get the shots.

data from CDC also confirms, the agency reports that about 1,500 out of every million people hospitalized with Covid have heart failure.

Inflammation of the heart can often cause fatigue, shortness of breath and chest pain for patients.

People with an inflamed heart have a higher risk of heart failure, heart attack, and stroke.

Attempting strenuous physical activity with an inflamed heart can potentially lead to sudden cardiac arrest or even death.


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