A new study conducted in one county in Minnesota has found an increased likelihood that citizens who received the Johnson & Johnson’s COVID-19 vaccine were more likely to develop blood clots.
The study by the Mayo Clinic found that recipients of the Johnson & Johnson vaccine, officially designated “Janssen,” in Olmsted County, Minnesota, were about 3.7 times more likely to develop a certain variety of cerebral blood clots. Case numbers taken from February 28 to May 7, 2021, were compared to pre-pandemic levels of the blood clots from January 1, 2001, through December 31, 2015.
In this population-based cohort study, we found that the CVST incidence rate 15 days after Ad26.COV2.S vaccination was significantly higher than the prepandemic rate. However, the higher rate of this rare adverse effect must be considered in the context of the effectiveness of the vaccine in preventing COVID-19 (absolute reduction of severe or critical COVID-19 of 940 per 100 000 PY).
One of the European drug regulator’s senior officials today claimed there is now a ‘clear’ link between AstraZeneca’s Covid vaccine and potentially deadly blood clots.
Marco Cavaleri, head of vaccines at the European Medicines Agency (EMA), said that CVST — a brain blockage that can lead to a stroke — was occurring more often than expected in younger people.
..The UK’s safety watchdog, the MHRA, has so far spotted 30 rare clotting events in 18.1million doses – around one in every 600,000. But the EMA believes it may occur in up to one in every 100,000 under-60s.