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

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.

Blood clotting, and specifically cerebral venous sinus thrombosis (CVST) is a well known side-effect of the J&J vaccine, and the discovery of this risk was the reason usage of the vaccine was paused in April.

However, the team insists the risk is rare and that the findings must be looked at in the context of the effectiveness of the vaccine in preventing severe cases COVID-19.

Researchers, who published their findings in JAMA Internal Medicine on Monday, gathered data from Olmstead, County, Minnesota – a county of around 158,000 people 90 miles southeast of Minneapolis – from 2001 to 2015.

Written by Mansur Shaheen U.S. Deputy Health Editor For Dailymail

Full report at Daily Mail

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