J&J refutes ‘class effect’ to blame for vaccine clots

CHICAGO: Scientists at Johnson & Johnson on Friday refuted an assertion in a major medical journal that the design of their Covid-19 vaccine, which is similar AstraZeneca’s, may explain why both have been linked to very rare brain blood clots in some vaccine recipients.

The US earlier this week paused distribution of the J&J vaccine to investigate six cases of a rare brain blood clot known as cerebral venous sinus thrombosis (CVST), accompanied by a low blood platelet count, in US women under age 50, out of about 7 million people who got the shot.

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