This English study wanted to analyze the possible side effects of the Covid vaccine, recorded in the days immediately following inoculation. Here is the research in detail.
Now that millions of people have been vaccinated with the different sera, some empirical studies have recorded the most common collateral disorders of the Covid vaccine , which when they do occur are generally mild and of short duration. Many, in fact, are those who have absolutely no ailment: only one person in 4, in fact, declared having had side effects. Here are the most common.
The English study
Fever, headache, nausea and feeling of fatigue, which however only last one day: these are in fact the most common side effects experienced by those who have been vaccinated against Covid. This is what emerged from the findings of the researchers involved in a study performed through an app, Zoe Covid Symptom Study, as reported by the BBC. In the field, however, fewer reactions were found at a percentage level than those recorded in clinical studies. In the UK, the vaccination campaign is at a very advanced stage with over 48 million people who have already received the first dose, equal to 70.9 per 100 inhabitants. Through the app, researchers from King’s College London were able to follow the symptoms of over 600,000 people, according to the description of the vaccinated themselves, within 8 days after inoculation. (Read More: Covid-19: Pfizer checks whether vaccinated people infect others)
The most common side effects
Based on these descriptions, about 70% of people who have had the Pfizer vaccine have experienced some reaction in the needle entry area, including mild pain, redness or swelling, while in the case of AstraZeneca this nuisance was reported by less than 60% of people. Some more general reactions are reported at the first inoculation of the AstraZeneca vaccine and at the second of Pfizer, but these are always minor annoyances: after the injection with the Anglo-Swedish vaccine about 34% had headaches, feelings of exhaustion, chills; reported for Pfizer at 14% after the first dose and 22% at the second. Reactions to the second dose of AstraZeneca did not enter the sample because they had not yet taken place: the booster is set three months after the first dose. To coordinate the study, prof. Tim Spector of King’s College London, who underlined how the symptoms are “generally mild and of short duration” although there is a range of subjective responses to vaccines that depends on many variables. Women, people under 55, and those who have had a Covid infection in the past were the most likely to experience side effects. (Also Read:Covid, the symptoms to watch out for are changing: more nausea and fatigue, less cough )
Overall, based on the app screening, 25% had one of these mild, momentary whole-body reactions, while 66% had a local reaction. A significant figure concerns the lower percentages of side effects found in the field compared to those that had been observed in clinical trials. In the last phase of the Pfizer vaccine tests, about 77% of people had complained of pain at the injection site, while in this survey the percentage dropped to less than 30%. For AstraZeneca, fever and fatigue were less than half of what was seen in clinical trials. It is hypothesized that this may be due to a state of greater nervousness and anxiety than those who had previously undergone the tests of the new vaccines, or perhaps because they were young people. safety of both Pfizer and AstraZeneca vaccines.