In general,
the rashes are benign, with the exception of the rarely
encountered Stevens-Johnson Syndrome. The underlying
mechanism is uncertain and may be either allergic or
toxic or both.
There appears to be no predilection for these rashes,
although some believe that allergic persons may be more
likely to develop them. Immunologic data on affected
vaccinees is lacking. Some investigators believe that
a concurrent enterovirus infection causes the rash but
data are insufficient to determine if this is a true
association.
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