At least 21 and 37, respectively, have
developed nonfatal inflammation of the heart, called myopericarditis; three other
vaccine recipients suffered fatal heart attacks, which have not been definitively tied to
vaccines.
One concern is the development of multiple sclerosis, which has been fuelled by social and news media reports of cases occurring after HPV vaccination, and an increasing number of case reports published in the medical literature describing
vaccine recipients who
developed multiple sclerosis as well as other demyelinating diseases.