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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 ...
Why might some COVID-19 vaccines pose a small risk of blood clots while others don't? Scientists suspect it's related to their use of adenoviruses.
A January 2024 study by the CDC found that staying up to date on the vaccines could reduce the risk of strokes, blood clots and heart attacks related to COVID-19 in people aged 65 years or older or with a condition that makes them more vulnerable to said conditions.
A study conducted on 44 rats injected with the Pfizer–BioNTech COVID-19 vaccine at doses over 300 times the human dose by body weight and 44 rats injected with placebo found no statistically significant evidence of any adverse effects on the fertility of female rats or on the health of the offspring of rats (the 3% lower pregnancy rate found ...
The blood clots in patients who received the J&J vaccine bear close resemblance to 169 cases in Europe reported with the AstraZeneca vaccine, out of 34 million doses administered there.
Johnson & Johnson's COVID-19 vaccine may pose a "small possible risk" of a rare but potentially dangerous neurological reaction, U.S. health officials said Monday.
The diagnosis of Stevens–Johnson syndrome is based on involvement of less than 10% of the skin. [2] It is known as TEN when more than 30% of the skin is involved and considered an intermediate form when 10–30% is involved. [3] SJS/TEN reactions are believed to follow a type IV hypersensitivity mechanism. [7]
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 ...