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J&J asked Pfizer and Moderna to help study blood clot risks but they declined, report says

April 16, 2021


Johnson & Johnson privately asked Covid-19 vaccine rivals Pfizer and Moderna to join a study looking into the potential risk of blood clots but the companies declined, The Wall Street Journal reported Friday, citing people familiar with the matter.

Executives at Pfizer and Moderna said their vaccines appeared safe and they didn’t see the need to duplicate the efforts of regulators and companies already looking into the rare blood clot issue, according to the Journal report.

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