Natural viral infections with influenza, hepatitis A, measles, mumps and rubella and varicella have all been associated with myelitis, albeit rarely. Thus, these viral vaccines may prevent transverse myelitis by protecting against natural infection. Vaccines currently routinely recommended to the general population in the U.S.* have not been shown to cause transverse myelitis.
The 2012 report by the Institute of Medicine (IOM), now called the National Academy of Medicine (NAM), found no relevant studies of quality in the literature assessing an association between transverse myelitis and MMR, varicella, influenza, hepatitis A, hepatitis B, HPV, meningococcal conjugate, diphtheria, tetanus or pertussis vaccines, since the only applicable studies available either had serious methodological limitations or used passive surveillance systems and therefore lacked an unvaccinated comparison group .
Two Vaccine Safety Datalink studies published since the 2012 IOM report found no cases of transverse myelitis in over 200,000 pregnant women within 42 days after receiving trivalent inactivated influenza vaccine  and in over 9,000 pregnant women within 42 days after receiving 2009 H1N1 pandemic influenza vaccine . A cohort study of 3,983,824 females 10-44 years of age in Denmark and Sweden found no association between quadrivalent HPV vaccine and demyelinating diseases, including transverse myelitis .
Natural infection with wild-type influenza, hepatitis A, measles, mumps and rubella viruses, as well as herpes zoster and reactivation of latent wild-type varicella virus, have all been associated with transverse myelitis, albeit rarely. Mechanisms that could contribute to transverse myelitis include viral reactivation , as well as molecular mimicry, which refers to the possibility that similar epitopes shared between self-peptides and foreign peptides (introduced via infection or immunization) inadvertently cause the activation of autoreactive T or B cells, leading to autoimmunity.
The 2012 IOM report described a few cases of transverse myelitis after MMR [5-7], varicella , and hepatitis B vaccines , but even when also considering knowledge about the aforementioned natural infections the IOM concluded this mechanistic evidence was weak. The IOM also concluded that there was no mechanistic evidence for an association between transverse myelitis and HPV, meningococcal conjugate, diphtheria, tetanus and pertussis vaccines .
* These conclusions do not necessarily consider vaccines recommended only for special populations in the United States such as Yellow Fever vaccine (international travelers) or Smallpox vaccine (military personnel).
1. Institute of Medicine. In: Stratton K, Ford A, Rusch E, Clayton EW, eds. Adverse Effects of Vaccines: Evidence and Causality. Washington (DC): National Academies Press (US); 2012.
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