Research suggests a potential link between viral infections, including SARS-CoV-2, and the development of Alzheimer's disease. Some studies indicate that SARS-CoV-2 infection may lead to the buildup of Alzheimer's-related peptides, while others propose an immunological model to explain the relationship between infection, vaccination, and dementia risk. The role of infections in Alzheimer's disease is being explored, with some findings suggesting a possible connection, although the relationship is not yet fully understood.