Immunologist J. Bart Classen warns that the Pfizer-BioNTech and Moderna vaccines for COVID-19 can potentially cause neurodegenerative disorders, such as Alzheimer's disease.
In a paper published in the journal Microbiology & Infectious Diseases, Classen reported that mRNA-based vaccines like the two jabs can misfold proteins in the body that are linked to the development of neurodegenerative disorders.
Long-term risks of Pfizer and Moderna vaccines
The Pfizer-BioNTech and Moderna vaccines are the only jabs for COVID-19 approved for use in the United States. They are also the first vaccines made using mRNA technology to be approved for human use.
Both jabs work by injecting genetic material called mRNA that codes for a critical fragment of the spike protein – the molecule used by SARS-CoV-2, the virus responsible for COVID-19 – to infect human cells. Once this genetic material is inside the body, the muscle cells translate them to make the spike protein.
The immune system then gets a preview of what the real virus looks like without supposedly causing disease. When a vaccinated individual gets infected, the immune system releases antibodies that can neutralize the real virus and protect the individual from COVID-19.
But in his study, Classen found that mRNA-vaccines could favor the development of various diseases.