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On Tuesday, April 13, the Centers for Disease Control and Prevention and the Food and Drug Administration announced a joint recommendation to pause distribution of the Johnson & Johnson vaccine after reported cases of rare blood clotting events in recipients. As a result, Mayo Clinic will follow this guidance and pause on delivering the Johnson & Johnson vaccine until further notice.

This pause affects only Mayo Clinic locations in the Midwest. Mayo Clinic in Arizona and Florida did not administer the Johnson & Johnson vaccine.

Why is the FDA and CDC recommending a pause on distributing the Johnson & Johnson vaccine?

Out of an abundance of caution, the FDA and CDC recommends a pause on the Johnson & Johnson vaccine based on six rare blood clotting events in recipients. While a review is underway to address next steps, the FDA and CDC are asking health care providers to watch for, evaluate and report cases.

How long will this pause last?

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The Advisory Committee on Immunization Practices is meeting Wednesday, April 14, to evaluate and review the data from the rare adverse event cases reported so far. ACIP is an independent immunization advisory group for the federal government agencies. Based on that evaluation and recommendation the FDA and CDC may communicate their findings and next steps regarding this pause. Mayo Clinic is committed to patient safety and will take the time required to understand more about the evolving situation.

What should patients who have received Johnson & Johnson do at this time?

This rare blood clotting reaction has occurred in 6 people out of nearly 7 million people who have received the Johnson & Johnson vaccine. The six cases involved women between ages 18 and 48 and occurred 6 to 13 days after vaccination.

If you have received the Johnson & Johnson COVID-19 vaccine in the last three weeks and are experiencing unexplained new severe symptoms between three days to three weeks after vaccination, such as new severe headaches, leg pain, abdominal pain or shortness of breath, you should seek emergency care.

Note: Experiencing mild to moderate headache and muscle aches are common in the first 3 days after vaccination and do not require emergency care.

Does this affect the Pfizer and Moderna vaccines?

Evidence of this rare clotting disorder has not been reported in either the Pfizer and Moderna vaccines.

Get answers to your questions

Visit the COVID-19 Information Center for more resources, including answers to FAQs regarding the safety, eligibility, availability and timing of COVID-19 vaccines. To learn about Mayo's recommendations for the public, check the COVID-19 information on

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