The blood clots occurred in women between 18 to 48 years old. The women also had low levels of blood platelets.
Blood clots linked to J&J shot are extremely rare
Johnson & Johnson reported that six women, out of 6.8 million people dosed, developed blood clots six to 13 days after vaccination. Experts aren't sure why these blood-clot cases developed — or even whether there's a definite cause-and-effect relationship with the vaccine. Here's everything you need to know.