Nearly 170 million Americans have received the COVID-19 vaccine developed by Pfizer(NYSE:PFE) and BioNTech(NASDAQ:BNTX). More than 129 million Americans have received Moderna's (NASDAQ:MRNA) vaccine. So far, the vaccines have appeared to be both highly effective and safe. 

However, the Centers for Disease Control and Prevention (CDC) is convening an "emergency meeting" of an advisory panel on June 18. The panel will discuss higher-than-expected reports of heart inflammation issues in young men following the second dose of the two messenger RNA (mRNA) COVID-19 vaccines. How worrisome are these heart issues reported with Pfizer's and Moderna's COVID-19 vaccines?

The CDC and the U.S. Food and Drug Administration (FDA) jointly run the Vaccine Adverse Event Reporting System (VAERS), which tracks reports of any side effects after individuals have received a COVID-19 vaccine. Most adverse events reported in VAERS aren't serious.

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