How might the COVID-19 vaccine contribute to the onset or exacerbation of autoimmune diseases like multiple sclerosis, particularly in regions where MS is less prevalent, such as Ecuador?

How do COVID-19 vaccines potentially influence the onset or progression of multiple sclerosis (MS), especially in regions like Ecuador where MS is less common, considering reports of individuals experiencing their first MS flare-ups shortly after vaccination, suggesting a possible link to immune-related complications?