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  2. Embolic and thrombotic events after COVID-19 vaccination

    en.wikipedia.org/wiki/Embolic_and_thrombotic...

    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 ...

  3. COVID-19 vaccine clinical research - Wikipedia

    en.wikipedia.org/wiki/COVID-19_vaccine_clinical...

    In Com-COV2, the first dose is the Oxford–AstraZeneca vaccine or the Pfizer vaccine, and the second dose is the Moderna vaccine, the Novavax vaccine, or a homologous vaccine equal to the first dose, with an interval of 56 or 84 days between doses. [333]

  4. Pfizer–BioNTech COVID-19 vaccine - Wikipedia

    en.wikipedia.org/wiki/Pfizer–BioNTech_COVID-19...

    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]

  5. COVID-19 vaccine - Wikipedia

    en.wikipedia.org/wiki/COVID-19_vaccine

    How COVID‑19 vaccines work. The video shows the process of vaccination, from injection with RNA or viral vector vaccines, to uptake and translation, and on to immune system stimulation and effect. Part of a series on the COVID-19 pandemic Scientifically accurate atomic model of the external structure of SARS-CoV-2. Each "ball" is an atom. COVID-19 (disease) SARS-CoV-2 (virus) Cases Deaths ...

  6. Oxford–AstraZeneca COVID-19 vaccine - Wikipedia

    en.wikipedia.org/wiki/Oxford–AstraZeneca_COVID...

    A regimen of two doses of the Oxford–AstraZeneca vaccine followed by a booster dose of the Pfizer–BioNTech or the Moderna vaccine is initially about 60% effective against symptomatic disease caused by Omicron, then after 10 weeks the effectiveness drops to about 35% with the Pfizer–BioNTech and to about 45% with the Moderna vaccine. [62]

  7. COVID-19 vaccination in the Republic of Ireland - Wikipedia

    en.wikipedia.org/wiki/COVID-19_vaccination_in...

    77.1% of the Irish adult population (18+) have received a first booster dose 27.7% of the Irish adult population (18+) have received a second booster dose 8.5% of the Irish adult population (18+) have received a third booster dose Website gov.ie As of February 2023 Part of a series on the COVID-19 pandemic Scientifically accurate atomic model of the external structure of SARS-CoV-2. Each "ball ...

  8. Moderna COVID-19 vaccine - Wikipedia

    en.wikipedia.org/wiki/Moderna_COVID-19_vaccine

    In September 2021, a study funded by the National Institute of Allergy and Infectious Diseases reported a strong immune response after six months, even at low doses, suggesting that more doses could be deployed from a limited vaccine supply. Six months after low-dose vaccination, 67% of participants still had memory cytotoxic T cells ...

  9. Novavax COVID-19 vaccine - Wikipedia

    en.wikipedia.org/wiki/Novavax_COVID-19_vaccine

    In June 2021, a primary Novavax-funded study found that the vaccine has an overall efficacy of 83.4% two weeks after the first dose and 89.7% one week after the second dose. [37] A post hoc analysis showed an efficacy of 86.3% against the B.1.1.7 (Alpha) variant and 96.4% against "non-B.1.1.7 strains", the majority of which were the "prototype ...

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