How antibodies may cause rare blood clots after some COVID-19 vaccines
The shots’ benefits continue to outweigh the risk of the uncommon side effect, experts say
![image of three boxes of vials containing Johnson & Johnson's COVID-19 vaccine](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/07/070621_eg_covid-vaccine-blood-clots_feat.jpg?fit=1030%2C580&ssl=1)
In April, public health officials linked Johnson & Johnson's COVID-19 vaccine (pictured) to rare blood clots. Antibodies linked to the condition attach to a specific spot on a protein involved in clot formation, a study suggests.
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