A study that set out to examine if the ability of COVID-19 vaccines to protect against deaths was offset by potential negative impacts of the vaccine on the immune system found that The Pfizer and Moderna COVID-19 vaccines did not impact overall mortality. The authors also noted the study limitations.
The two vaccines, both based on messenger RNA (mRNA) technology, protected against deaths from COVID-19 but that effect was offset by vaccinated trial participants being more likely to die from cardiovascular problems, Christine Stabell Benn, a health professor at the University of Southern Denmark, and other researchers reported in April in the Cell journal.
