Federal health agencies will temporarily stop using Johnson & Johnson’s one-dose vaccine after six women developed blood clots, including one who died, according to officials and a new report Tuesday. 

The Food and Drug Adminstration announced the pause, saying there’ve been a half-dozen reports of a “rare & severe type of blood clot” in patients who received the vaccine. 

The clots were observed along with reduced platelet counts, making the usual treatment for blood clots — the blood thinner heparin — potentially “dangerous.”

“Right now, these adverse events appear to be extremely rare,” the agency tweeted in a joint statement with the Centers for Disease Control and Prevention. 

Those affected were six women, between the ages of 18 and 48, who developed the clots within about two weeks of vaccination, the New York Times reported.

One died and a second in Nebraska was hospitalized in critical condition.

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People who received the J&J vaccine who are experiencing severe headache, abdominal pain, leg pain or shortness of breath within three weeks after receiving the jab are advised to contact their health care provider.

The feds hope the pause will serve as a strong signal to states to do the same.

“We are recommending a pause in the use of this vaccine out of an abundance of caution,” the FDA said. “Treatment of this specific type of blood clot is different from the treatment that might typically be administered.” 

In the US, 300,000 to 600,000 people a year develop blood clots, according CDC data cited by the Times, which reported that the particular clotting disorder that the J&J recipients developed, known as cerebral venous thrombosis, is extremely rare.

All of the women developed the condition within between six and 16 days of being inoculated, the paper reported, and experts are concerned that an immune system response triggered by the jab was the cause.

US will temporarily stop using Johnson & Johnson's COVID-19 vaccine (nypost.com)