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The EMA also initiated an assessment for all COVID‑19 vaccines used in the EU for immune thrombocytopenia (ITP), described as low blood platelet levels that could lead to bruising and bleeding, as a possible side effect, whilst also stating that up to this point no link with any COVID‑19 had been established. [12]
That’s a common reaction: A recent study found that 30-90% of people who got the COVID vaccine experienced some type of side effect, which can appear within 1–3 days after you get immunized.
Autoimmune/inflammatory syndrome induced by adjuvants (ASIA), or Shoenfeld's syndrome, is a hypothesised autoimmune disorder proposed by Israeli immunologist Yehuda Shoenfeld in 2011. [1] According to Shoenfeld, the syndrome is triggered by exposure to adjuvants and includes four conditions: " post-vaccination symptoms ", macrophagic ...
Vaccine efficacy is the reduction in risk of getting the disease by vaccinated participants in a controlled trial compared with the risk of getting the disease by unvaccinated participants. [346] An efficacy of 0% means that the vaccine does not work (identical to placebo).
The original vaccine was 90% effective against developing symptomatic COVID-19 infection and 100% effective against moderate and severe disease, according to results published in December 2021.
The Centers for Disease Control and Prevention identified more than 2.7 million Covid reinfections from September 2021 to December 2022 across a set of regions containing about 45% of the U.S ...
Antibody-dependent enhancement (ADE), sometimes less precisely called immune enhancement or disease enhancement, is a phenomenon in which binding of a virus to suboptimal antibodies enhances its entry into host cells, followed by its replication.
Unlike COVID-19, this is not a new virus—it has been circulating in the community at various levels for many years. Like other respiratory viruses, numbers of cases tend to go up during the ...