A recent Israeli study published on February 3, 2022, in the scientific journal Vaccines, found that women were twice as likely to report side effects following an injection of the Pfizer vaccine. Indeed, according to the scientists, women were 1.89 times more likely to experience side effects after the first dose of the vaccine and 1.82 times more likely after the second injection.
Side effects such as fatigue, muscle pain and headaches are more common in women than in men.
According to the researchers, the proportion of women who reported muscle pain at the injection site was seven times higher than men after the first dose and four times higher after the second injection. The ratio of women who reported headaches was 9.15 times higher after the first dose and 3.28 times higher after the second dose. Chills were also reported and were 5.25 times higher in women after the first dose and 4.26 times higher after the second injection.
Messenger RNA vaccines are not dangerous for people with cancer
Can people with cancer be vaccinated? American scientists are reassuring: mRNA vaccines, namely Pfizer and Moderna, do not pose a danger to cancer patients. A study conducted by the National Comprehensive Cancer Network (NCCN) and published in early February analyzed the side effects reported by more than 1,700 people with cancer between February and May 2021. All had received two injections of the Pfizer vaccine three weeks apart. Among them, 1,183 had a history of cancer, and 17.8% were still undergoing treatment. The results of the study are conclusive: the adverse effects reported by people with cancer are exactly the same as those that have occurred in the rest of the population. Therefore, mRNA vaccines appear to be safe for these patients. According to the study authors, they had never ” been included ” in most of the pilot studies on Covid-19 vaccines , ” despite their vulnerability to infection “.
The Pfizer vaccine is associated with a low but real risk of carditis.
Carditis is an inflammation of the heart most often caused by a viral, bacterial, or parasitic infection. The most common forms are myocarditis and pericarditis.
For the purposes of research published on January 25, 2022 in Annals of Internal Medicine , scientists assessed the risks of carditis associated with the Pfizer vaccine. They followed 160 patients over the age of 12 who were hospitalized for carditis and 1,533 hospitalized patients who did not have carditis.
They found that people who received the Pfizer vaccine were 3.57 times more likely to develop carditis than those who were not vaccinated. ” We observed an increased risk of carditis associated with the use of Pfizer, particularly in young men receiving the second dose ,” the study states.
They emphasize, however, that this risk is low, with the incidence of carditis being 0.57 per 100,000 Pfizer vaccine injections. Nevertheless, the researchers conclude that this risk “should be brought to the attention of vaccinated individuals and physicians and weighed against the benefits of vaccination.”
Comirnaty (Pfizer) and Spikevax ( Moderna) vaccines: cases of myocarditis and pericarditis reported
Rare cases of myocarditis and pericarditis have been reported to the health authority following administration of the Pfizer and Moderna vaccines. According to the agency, these cases “mainly occurred within 14 days of vaccination, more often after the second dose, and in relatively young men . ”
In an opinion published on July 23 , the ANSM (French National Agency for Medicines and Health Products Safety) recommended that healthcare professionals be attentive to “signs and symptoms associated with myocarditis and pericarditis” after the administration of an mRNA vaccine. “Healthcare professionals should advise vaccinated individuals to consult a doctor immediately in case of chest pain, shortness of breath, or palpitations ,” the health authority warned.
Messenger RNA vaccines: they do not increase cardiovascular risk in people under 75 years of age
The Pfizer and Moderna mRNA vaccines do not increase the risk of myocardial infarction, stroke, or pulmonary embolism in people under 75. This is the conclusion of a new study conducted by the Epi-Phare group, a joint initiative of the French National Agency for Medicines and Health Products Safety (ANSM) and the French National Health Insurance Fund (Cnam).
This research, released on January 18, analyzed the risk of cardiovascular events associated with the Pfizer, Moderna, AstraZeneca, and Janssen vaccines in individuals aged 18-74. “This study confirms the safety of mRNA vaccines with regard to the risk of serious cardiovascular events in adults ,” a press release stated. A previous study on the Pfizer vaccine, conducted in individuals over 75, found no evidence of an association between the Pfizer-BioNTech vaccine and the occurrence of serious cardiovascular events within 14 days of vaccination .
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