Side effects of the vaccine versus corona risks

Clalit’s research institute, in collaboration with researchers from Harvard University, analyzed medical data from over 2.4 million, the fund’s insured, and examined a wide range of side effects both among people who were vaccinated and among people who were not vaccinated and infected with the virus. This is the largest assessment tested to date with respect to corona vaccine safety, and it allows for a detailed and comprehensive assessment of vaccine safety in a wide range of side effects.


The study compared the prevalence of 25 potential side effects between vaccinated and unvaccinated separately, and compared those who were not vaccinated between those who contracted the virus and those who did not. The study, published tonight (Thursday) in the scientific journal The New England Journal of Medicine, relies on an analysis of millions of anonymous electronic medical records. It started in December and the data collection was done over 5 months.

The study did not focus on common immediate symptoms such as fever and redness after vaccination, but rather on clinically significant adverse events that developed within 6 weeks of receiving the first vaccine. Mild side effects that were found to be moderately related to the vaccine were standard responses to the vaccine, such as swelling of the lymph nodes and appendicitis found in 5 cases per 100,000 (perhaps as a result of swelling of the lymph nodes around the appendix).

Serious side effects in unvaccinated people

In contrast to a relatively small number of vaccine.related side effects, much higher rates of serious side effects were found in unvaccinated patients, such as arrhythmias (3.8 percent increase compared to vaccinated), kidney damage (14.8.fold increase), and pericarditis (increase Of 5.4 times), pulmonary embolism (increase of 12.1 times), myocardial infarction (increase of 4.5 times) and stroke (increase of 2.1).

An interesting statistic concerns the prevalence of myocarditis, the most well.known side effect of the vaccine. According to the data, it increased by 2.7 cases per 100,000 vaccinated people, compared with 11 cases in 100,000 people who were not vaccinated.

Reconsider whether to get vaccinated | Photo: Yonatan Sindel, Flash 90


“The data should make it easier to decide whether to get vaccinated”

“These results convincingly show that the vaccine is very safe and the alternative of natural morbidity caused by the coronavirus puts the person at significant, high and much more common risk for serious side effects.” Said Professor Ran Blitzer, senior author of research and director of Clalit’s research institute. “These data should facilitate individual risk.benefit decisions.”

Doron Netzer, Chief Medical Officer of Clalit’s Community Health Division, explains that “this study sheds light for the first time on the significant side effects of the coronary vaccine, as it is a more comprehensive surgery based on electronic medical records. These are more reliable assessments than those published to date Voluntary active reporting. ”



The biggest article to date on the safety of the corona vaccine, a product of the continued continued collaboration between Clalit and Harvard, has been unveiled with great excitement.

In short – the vaccine is very safe
It is followed by an excess morbidity in myocarditis (3.7 per 100k) but after infection with corona there are several times

And after corona, but not after vaccination, there is an excess of…


. Ran Balicer (@RanBalicer) August 25, 2021


“This meticulous epidemiological study provides reliable information on vaccine safety, which we hope will help those who have not yet decided on a vaccine.” Said Prof. Ben Rice, principal of Harvard Medical School. “Anyone who has been hesitant to get vaccinated so far for fear of extremely rare side effects, such as heart muscle, should be aware that the risks of that side effect are higher among people who are not vaccinated.”


By Editor

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