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The rare simultaneous occurrence of thrombocytopenia (low blood platelets) with blood clots after vaccination raised the original concern about this condition. [citation needed] In many cases where acute thrombosis and thrombocytopenia have been found together after COVID‑19 vaccination, an antibody against platelet factor 4 has been ...
Yale researchers have found clues as to why certain people experience adverse health effects after the COVID-19 vaccine, which they have dubbed “post-vaccination syndrome."
In the UK, 15,121 health care workers from 104 hospitals who had tested negative for antibodies prior to the study, were followed by RT-PCR tests twice a week from 7 December 2020 to 5 February 2021, a study compared the positive results for the 90.7% vaccinated share of their cohort with the 9.3% unvaccinated share, and found that the Pfizer ...
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Children 5 to 11. 1 dose of new Pfizer or Moderna vaccine ... natural immunity to level off after several ... of Pfizer’s FDA-approved COVID vaccine for people 12 and older. Each dose contains ...
A test-negative [note 1] case-control study published in August 2021, found that two doses of the BNT162b2 (Pfizer) vaccine had 93.7% effectiveness against symptomatic disease caused by the alpha (B.1.1.7) variant and 88.0% effectiveness against symptomatic disease caused by the delta (B.1.617.2) variant. [87]
Mechanisms underlying the cause of reactogenicity symptoms. In clinical trials, reactogenicity is the capacity of a vaccine to produce common, "expected" adverse reactions, especially excessive immunological responses and associated signs and symptoms, including fever and sore arm at the injection site.
Pfizer, one of the world's largest pharmaceutical companies, became a household name in 2020 when it was the first to have its COVID-19 vaccine authorized for use by the FDA. Now, in early November...