Research studies are currently underway to evaluate the safety, tolerability, and immunogenicity of the both the Pfizer-BioNTech and Moderna COVID-19 vaccines in children 6 months to 11 years of age. The most commonly reported side effects with this vaccine were pain at the injection site, headache, fatigue, muscle aches and nausea. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. About Massachusetts General HospitalMassachusetts General Hospital, founded in 1811, is the original and largest teaching hospital of Harvard Medical School. A recent study from the New York Blood Center published in Science Magazine examined the efficacy of the Pfizer, Janssen Biotech and Moderna vaccines to combat variants of the virus. These FAQs were created in anticipation of questions or concerns individuals with bleeding disorders may have about the new COVID-19 vaccines. Currently there is no reason to choose a particular type of vaccine. ]]> undefined will no longer be visible to you including posts, replies, and photos. Receiving emicizumab is not a reason not to receive a vaccine to prevent COVID-19 infection. More information on prescribing Comirnaty can be found at https://www.fda.gov/vaccines-blood-biologics/comirnaty. What is the vaccine emergency use authorization (EUA) in the United States? Pfizer-BioNTech Physicians might therefore mistakenly assume that patients instead have a deficiency in vitamin K. This investigation was spurred by the surprising case we encountered, and was conducted rapidly by an interdisciplinary pathology team at Mass General during the peak of the pandemic, said Jonathan Stefely, MD, PhD, one of the studys co-authors. I am concerned about getting the Covid Vaccine, either Moderna or Pfizer. My 30 yr old son who is homozygous for Factor V also developed blood clots in both of his lungs 2 weeks after getting the Pfizer vaccine.