Americans who received the one-dose Johnson & Johnson COVID-19 vaccine were 3.5 times as likely to develop rare blood clots compared to the general population, study finds

Daily Mail | 2 Nov 2021

  • Recipients of the J&J COVID-19 vaccine are 3.5 times as likely to develop a rare, deadly, blood clotting condition than the general population, a new study finds
  • Researchers found that 8.5 J&J recipients developed the clots for every 100,000 person years, compared to only 2.5 out of the general population
  • Researchers found that women between aged 30 and 64 were most at risk of developing the clotting 
  • Authorization of the vaccine was paused for ten days during April due to concerns of the blood clotting developing in women 
  • Cerebral venous sinus thrombosis, or CVST, is a dangerous condition that can cause a person to suffer stroke, or even die

Johnson & Johnson‘s COVID-19 vaccine increases a person’s risk of developing rare blood clots, a new study suggests.

Researchers from the Mayo Clinic in Rochester, Minnesota, compared data from the general population before the pandemic to data gathered from reported vaccine side-effects suffered by Americans.

They found that a person who received the vaccine was 3.5 times as likely to develop brain blood clots as an average person before the pandemic.

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