According to a study published Monday that used official Covid data from England, the AstraZeneca Covid-19 vaccine more than tripled the risk of cardiac death in young women.
Senior Statistician at the Office for National Statistics (ONS), Vahé Nafilyan, researchers found "receiving a first dose of a non-mRNA vaccine was associated with an increased risk of cardiac death in young women."
No evidence was found that there was an increased risk of death in young people after an mRNA vaccine. Both the Pfizer and Moderna shots are mRNA vaccines.
For the study, the ONS compared deaths of people between the ages of 12 and 29 that occurred within 12 weeks of receiving the Covid vaccine, which is known as the risk period, to the deaths that occurred at all times after the risk period, to estimate the risk of death after vaccination.
While the cross-reference of deaths with a history of Covid vaccination showed "no significant increase in cardiac or all-cause mortality" within 12 weeks of vaccination, the ONS found more alarming results when compared with mRNA vaccines.
According to a breakdown of data, the risk of cardiac death among young women was 3 times greater during the risk period when it followed any does of a non-mRNA vaccine, compared with long-term risk.
The risk of cardiac death in young women rose to 3.5 times higher within 12 weeks of vaccination when they only received the first dose.
The ONS did note, however, that the group who received non-mRNA vaccines "was more likely to be clinically vulnerable and may be at greater risk of adverse events following vaccination than the general population." It also pointed out that the total number of deaths was small.
"According to the statistic model, 11 out of 15 cardiac deaths in young women that occurred within 12 weeks of a first dose of a non-mRNA vaccine were likely to be linked to the vaccine; this corresponds to 6 cardiac-related deaths per 100,000 females vaccinated with at least a first dose of a non-mRNA vaccine," the ONS said.
The study not only examined non-mRNA vaccine-related deaths but also the effects of Covid on young people. The ONS concluded that a positive Covid test was associated with an increase in cardiac and all-cause mortality, with the risk being even higher in people who were unvaccinated at the time they received testing than in those who had been vaccinated.
The ONS did acknowledge the limitations of its model, pointing out that some deaths that occurred during the high-risk period may not have been registered by the cut-off timeframe due to deaths of young people and deaths that occurred close to the time of vaccination were more likely to be referred to the coroner, who was behind and noted that "registration delays can be substantial."
The study also noted that most sudden cardiac deaths occur outside of hospitals and are thereby more likely to be subjected to registration delays and, therefore, not included in the data.
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