Also known as
Aseptic Meningitis, this form of poliomyelitis is observed in about 1 to 2% of individuals infected with
the poliovirus. It is a more severe form of the disease that develops approximately 7 to 14 days after exposure to the virus.
The early symptoms can be similar to minor polio symptoms but in addition, these may also occur:

Stiffness in the neck, back and
legs

Muscle pain

Muscle spasms

Abnormal skin sensation
These symptoms improve rapidly, usually within 2 to 10 days, with complete recovery.