Lyon just posted a terrific listing of differential diagnosis on the site-
It includes a description of ADEM- a demyelination disease that occurs suddenly after infection or vaccination. This doesn't imply that vaccinations cause MS, but that it may create a situation that looks an awful lot like MS.
Acute disseminated encephalomyelitis
Monophasic demyelination occurring with or
just after an infection, vaccination, or other
The symptoms can be identical,
including involvement of optic
nerve, brain, and spinal cord,
and the MRI may show
identical scattered white-matter
There is no infallible method of
distinguishing ADEM from MS. It
occurs in the setting of infections,
is more common in childhood, and
may include altered consciousness
and other unusual symptoms, and
the MRI may show hemorrhagic
lesions and/or gray matter lesions
http://www.neurology.wisc.edu/publicati ... euro_7.pdf
Acute Disseminated Encephalomyelitis (ADEM)
What is Acute Disseminated Encephalomyelitis?
Acute disseminated encephalomyelitis (ADEM) is a neurological disorder characterized by inflammation of the brain and spinal cord caused by damage to the myelin sheath. The myelin sheath is the fatty covering, which acts as an insulator, on nerve fibers in the brain. ADEM may occur in association with a viral or bacterial infection, as a complication of inoculation or vaccination, or without a preceding cause. Onset of the disorder is sudden. Symptoms, which vary among individuals, may include headache, delirium, lethargy, coma, seizures, stiff neck, fever, ataxia, optic neuritis, transverse myelitis, vomiting, and weight loss. Other symptoms may include monoparesis (paralysis of a single limb) or hemiplegia (paralysis on one side of the body). The disorder occurs in children more often than in adults.