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A CDC advisory committee is debating the safety of the Johnson & Johnson COVID-19 vaccine today after the CDC and FDA recommended that states hold off on using it after six women developed a rare but serious blood clot after getting the single-dose vaccine.

The clot occurred in the vessels that drain blood from the brain and the six patients also had a a large drop in platelets, which increases the risk of bleeding.

This combination can lead to severe strokes that can lead to brain damage or death. Among the six cases, which came to light at the end of March and beginning of April, according to the CDC, one person died. They ranged in age from 18 to 48. More than 6.8 million doses of the Johnson & Johnson vaccine have been administered in the U.S.

Head over to WebMD to read the full story.