US health authorities are calling for a pause in the use of the Johnson & Johnson COVID-19 vaccine, after reports of extremely rare blood clotting cases.
The Food and Drug Administration (FDA) said it was acting out of an abundance of caution.
It said six cases of severe blood clotting had been detected in more than 6.8 million doses of the vaccine.
The recommendation follows similar rare cases in the AstraZeneca vaccine, which has prompted some curbs in its use.
In a series of tweets, the FDA said it and the Centers for Disease Control and Prevention (CDC) were reviewing six reported US cases of a rare and severe type of blood clot in individuals after receiving the vaccine.
All six cases were in women aged between 18 and 48, with symptoms six to 13 days after vaccination.
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