![jamanetwork.com](https://cdn.jamanetwork.com/ama/content_public/journal/jama/938849/joi210145t1_1647635624.40291.png?Expires=2147483647&Signature=vnWEr29kzdodbFqGmobYcoskmuWbMFxIC2bVCXj-fGLVDL9mXF06O-lCfiVRdJxl5cXOz5JOpmRa3W6d4Qtgz-MpkeXlcbHrdorLqQnDyDXVAP7qYoaDU~7Fw0oAGU4a0wAaXX7Gjka4XJ6r6xdVIID5Gyr94xvEeDxVbbgx~OpNWaCEsZyLJ8R3LGQeqzuCTBwnbjtuz0ULRs54BsZJpu0VLyzyvZ6ok5UI4lK2wpO0D2hK9uPLpyyGsVf1rVe6dQuZxkFqHw30TBgDHZ~HpOQypNpcPleRD4Ihi-CaaurU3vq-z9TZlxxORTfYHZh~t0-TZVievae6puMjnJ0VUA__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Myocarditis Cases Reported After mRNA-Based COVID-19 Vaccination in the US From December 2020 to August 2021
This descriptive study compares the effect of mRNA-based COVID-19 vaccination with BNT162b2 (Pfizer-BioNTech) vs mRNA-1273 (Moderna) on the reported cases of myocarditis in the US after each vaccination dose.
![jamanetwork.com](https://cdn.jamanetwork.com/UI/app/img/favicons/jama/favicon-192x192.png)