The US Centers for Disease Control and Prevention and the US Food and Drug Administration are recommending that the United States pause the use of Johnson & Johnson’s Covid-19 vaccine over “six reported US cases of a rare and severe type of blood clot.”
A federal official previously told CNN that US health agencies were taking concerns about blood clots and the Johnson & Johnson vaccine "seriously."
An expert outside the government who is familiar with the situation agreed that health officials are taking the matter seriously.
There have been "four serious cases of unusual blood clots" reported after people received the Johnson & Johnson vaccine, according to European health authorities. Like their US counterparts, the European authorities are investigating these cases and that "it is currently not clear" whether there's a causal association between the vaccine and the clots.
The concern in the United States isn't just about the Johnson & Johnson shot per se.
At a time when US health officials are encouraging Americans to get vaccinated as soon as they can, there's a worry that news coverage about clots being studied in relation to Johnson & Johnson's vaccine might make some Americans more hesitant to get any Covid-19 vaccine.