Don't think there's any relationship to tonsil removal, Merlyn. Tonsillitis is non-specific...it can be caused by bacterial or viral infection. Poliomyelitis is a know virus. The virus is mostly killed, then kept intact enough to trigger the body's immune response thru a vaccine.
Salk studied many viruses-such as influenza--and worked on vaccines for these viruses. Some doctors believe MS is a yet unidentified virus....but many decades of research in this specific area has failed to reveal a direct link to any one virus. EBV has been linked..but it can't be the only cause of MS, or 99% of the world would have MS.
Thomas Rivers worked with Salk, and saw that early trials of vaccines sometimes failed, by creating paralytic accidents in the CNS. Here's a great paper explaining how Dr. Rivers came to create the EAE model of MS, utilizing this knowledge of foreign antigens and vaccines.
http://jem.rupress.org/content/early/20 ... a.full.pdf
The problems remains....the specific antigen has never been identified in MS. One would think that 60 years of microbiology would have found the antigen, if there was one...