poliovirus figures ii

• 90% = no or almost no symptoms

• 9% = nonparalytic polio

• 1% = spinal or bulbar polio of which :

• • • 10% die
    • 50% recovery fully
    • 40% are left with only partial recovery or permantent paralysis (either or both lower limps; quadriplegia or respiratory paralysis= 0.01%)