According to a study if you received one dose of the Johnson & Johnson COVID vaccine, you are 3.5 times more likely to develop blood clots compared to the unvaccinated general population. Researchers found that 8.5 J&J recipients developed the clots for every 100,000 persons, compared to only 2.5 out of the general population. Researchers found that women between aged 30 and 64 were most at risk of developing the clotting.
Earlier, German scientists found the exact 2 step process how the COVID-19 vaccine causes blood clots in recipients. They describe a series of events that has to happen in the body before the vaccines create these large clots.
German scientists have found out how the broken parts of Johnson & Johnson and AstraZeneca COVID-19 vaccines branded as Covishield in India mutate to trigger blood clots in recipients.
Scientists say the vaccine is sent into the cell nucleus instead of surrounding fluid, where parts of it break off and create mutated versions of themselves. The mutated versions then enter the body and trigger the blood clots.
Now, researchers from the Mayo Clinic in Rochester, Minnesota, compared data from the general population before the pandemic to data gathered from reported vaccine side-effects suffered by Americans.
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They found that a person who received the vaccine was 3.5 times as likely to develop brain blood clots as an average person before the pandemic.
Blood clotting, and specifically cerebral venous sinus thrombosis (CVST) is a well known side-effect of the J&J vaccine, and the discovery of this risk was the reason usage of the vaccine was paused in April.
The US CDC and FDA lifted their recommended pause on use of Johnson & Johnson’s coronavirus vaccine with a condition that it will now include a safety label warning that its vaccine comes with blood clot risks.
The US Food and Drug Administration has also warned that Johnson & Johnson’s single-dose Covid-19 vaccine can cause Guillain-Barre syndrome, a rare disorder where the immune system attacks the nervous system and can result in paralysis.
Researchers, who published their findings in JAMA Internal Medicine on Monday, gathered data from Olmstead, County, Minnesota – a county of around 158,000 people 90 miles southeast of Minneapolis – from 2001 to 2015.
They then used the Centers for Disease Control and Prevention’s Vaccine Adverse Event Reporting System (VAERS) to find diagnoses of blood clots in people who received the J&J vaccine between the jab’s approval date at the end of February 2021 to May 7.
During the 14-year period, there were 39 Olmstead residents who developed CVST – a rare, potentially deadly, blood clotting condition that can form in a person’s brain.
Of that group, 29 had a risk factor within the 92 days proceeding development of the blood clot, such as infection, active cancer, or oral contraceptives for women.
Adjusted for population, there were 2.46 cases of CVST out of every 100,000 person-years of the residents of Olmstead County developed blood clotting during that period.
They found 46 reports of CVST to VAERS after receiving the J&J vaccine, though eight were removed from the pool for either being duplicate reports or not being professionally diagnosed.
In total, 38 cases tied to the J&J vaccine were detected – with over 70 percent being among women.
When adjusted for population, there were 8.65 cases out of every 100,000 person-years among people who received the vaccine – a rate 3.5 times higher than the general population.
They also found that vaccine recipients are at most risk of developing the condition within the first 15 days after receiving the jab.
Women are also at most risk between ages 30 to 64.
While this study does give the level of increased risk from receiving the J&J vaccine, that existence of the risk itself has been known for some time.
On April 13, the Food and Drug Administration (FDA) paused its authorization of the Covid vaccine after six women were found to have developed blood clotting after receiving the shot.
All had pre-existing conditions that put them at an increased risk of developing the clots.
Ten days later, on April 23, usage of the vaccine was resumed, though the label was advised with a warning to women under the age of 50 about the blood clotting.
The J&J vaccine is the least popular of the three Covid jabs available in America, though its one-shot nature has increased its potential to be used internationally in areas with less resources available to give a jab twice.
The clotting, CVST, is potentially dangerous.
Blood clots will form within the veins in the outer layers of the brain, and it can block the blood from draining from the brain to the heart.
In the worst cases, it can cause a person to suffer a stroke, that could lead to death.