Federal officials on Tuesday pulled the brakes on the use of Johnson & Johnson’s vaccine after reports of six patients experiencing blood clots and a “stroke-like illness,” including one who died.

Who is being affected by the blood clots?

Six women, whose ages range from 18 to 48, experienced a “severe stroke-like illness” an average of nine days after receiving the J&J vaccine, officials said.

The FDA said the cases involved rare blood clots — known as cerebral venous sinus thrombosis or CVST — which draw blood from the brain, along with low platelet counts, a condition known as thrombocytopenia.

What are the symptoms of the blood clots?

Symptoms can include severe headaches, abdominal pain, leg pain or shortness of breath.

But health officials stressed that the warning signs shouldn’t be confused with the common symptoms associated with receiving the vaccine.

How common are the blood clots?

The six reports are among at least 6.8 million doses of the J&J vaccine that have been administered in the US since regulators approved the shot in late February.

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What are the risks associated with the condition?

Health professionals are urged to be on alert for warning signs of cerebral venous sinus thrombosis since it can be “dangerous” if the condition is treated with the blood-thinner Heparin, which is commonly used on other forms of blood clots.

What type of patients are most at risk for the blood clots?

Despite all of the impacted patients being women, regulators said it’s too early to tell if a certain subset of the population is more at risk for the blood clots.

Read more at NY Post.