26 July 2021, 09:07 pm A new COVID-19 study has shown that people who had an allergy after a first dose of an mRNA vaccine can safely receive a second dose. COVID-19 mRNA vaccines available are those from Moderna and Pfizer/BioNTech. The study, whose co-authors include Dr. Matthew Krantz, Dr. Jason Kwah, and Dr. Cosby Stone, has been published in JAMA Internal Medicine. COVID-19 Study: mRNA Vaccine Can Cause Allergic Reaction Any COVID-19 study have been helpful in learning not just how the virus itself works, but how the human body can be best protected. The new COVID-19 study published in JAMA Internal Medicine discusses the allergic reaction that some people have experienced upon receiving a first shot of an mRNA vaccine.