Journal: JAMA Netw Open
Lead Author: Clément Bernard, et al.
Original date of publication: 10/15/2025
Link: https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2840133
Keywords: adverse eventsBirth defectscovid vaccinationmajor congenital malformations (MCMs)mRNAreproductive harmvaccine safety
Full Author List: Clément Bernard, Tom Duchemin, Lise Marty
Lead Author: Clément Bernard, et al.
Original date of publication: 10/15/2025
Link: https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2840133
Summary Context
This is an instructive study on how data can be manipulated in a peer reviewed journal through exclusion– in this case, any fetus with a severe enough defect to lead to termination or fetal death was ignored. Statistical tests suggest hiding of signal.
Comments
This study found no association with mRNA injection and side effects for live births, but is only looking at the surviving 68% of fetal anomaly cases (terminations from severe complications, and stillbirth removed).
Abstract or Results, Key Passages
“First, the analysis was restricted to live births owing to difficulties in appropriately identifying MCMs among stillbirths and terminated pregnancies on the basis of health care data, similar to other studies on congenital anomalies based on this type of data.”
Keywords: adverse eventsBirth defectscovid vaccinationmajor congenital malformations (MCMs)mRNAreproductive harmvaccine safety
Full Author List: Clément Bernard, Tom Duchemin, Lise Marty
