New study analyzing large data shows no correlation between vaccinations and MS
Data from over 12,000 multiple sclerosis (MS) patients formed the basis of a study which investigated the population’s vaccination behavior in relation to MS. It showed that five years before their diagnosis, MS patients were statistically less likely to receive vaccinations than comparator groups. Consequently, there was no positive correlation between vaccinations and the development of MS.
MS is a neurological autoimmune disease in which the immune system attacks the brain and spinal cord. It is most likely to occur in young people under the age of 40. Vaccinations are often mentioned as a possible risk factor for MS.
MS is a neurological autoimmune disease in which the immune system attacks the brain and spinal cord. It is most likely to occur in young people under the age of 40. Vaccinations are often mentioned as a possible risk factor for MS
The data covered over 200,000 individuals, including more than 12,000 MS patients. The study was published in the latest issue of Neurology, the medical journal of the American Academy of Neurology.
The researchers found that five years before being diagnosed, individuals who went on to develop MS had received fewer vaccinations than those who did not develop MS. This applied to all the vaccines investigated including pneumococci, meningococci, mumps, measles, rubella, chickenpox, human papilloma virus (HPV), hepatitis A and B, tick-borne encephalitis (TBE) and influenza. The effect was particularly pronounced in the latter three cases: the control group had received significantly more vaccinations than the individuals who later developed MS.
“The causes are still a mystery. It may be that people perceive the disease long before they are diagnosed and therefore avoid putting additional stress on their immune system. Such effects are in fact evident in our data. Or perhaps the vaccines have a protective effect that prevents the immune system from attacking the nervous system. In any case, given the large volume of data analyzed, we can conclusively state that there is no evidence that recent vaccination increases the likelihood of MS or the onset of an initial MS episode”, Alexander Hapfelmeier, lead author of the study, explained.
The researchers also wanted to rule out the possibility that the results might be an underlying effect of chronic diseases in general. They therefore analyzed data from two other groups: patients with Crohn’s disease, an inflammatory bowel disorder, and patients with psoriasis, a chronic skin disease. The vaccinations of these patients had also been recorded five years before their diagnosis.
Those patients, however, had received as many vaccinations as the healthy control group. “Thus, the results are not due solely to the presence of a chronic inflammatory disease, but to behavior specific to MS,” said Professor Bernhard Hemmer, director of the Neurology Department of the TUM hospital, Klinikum rechts der Isar.
