Covid vaccine maker Moderna received 300,000 reports of side effects after vaccinations over a three-month period following the launch of its shot, according to an internal report from a company that helps Moderna manage the reports.
That figure is far higher than the number of side effect reports about Moderna’s vaccine publicly available in the federal system that tracks such adverse events.
Vaccine manufacturers like Moderna are legally required to forward all side effect reports they receive to the Vaccine Adverse Events Reporting System, where they are made public each week.
Run by the Centers for Disease Control and Food & Drug Administration, the VAERS system is crucial to tracking potential problems with vaccines. It helped scientists determine the Covid vaccines may cause heart problems in young adults.
The reason for the gap is not clear. Moderna may simply still be processing the reports, though the number of reports about Moderna’s vaccine in VAERS from the first half of 2021 remained almost flat this week.
Moderna and IQVIA, the company that works with Moderna to handle the reports, did not return emails for comment.
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