However, after exposure and an incubation period of about one to two weeks the virus can spread from the digestive tract to the central nervous system, resulting in meningitis and neural damage with paralysis (the latter in less than 1% of cases).
Vendar pa se po izpostavitvi in inkubacijski dobi približno enega do dveh tednov virus lahko razširi iz prebavil v centralni živčni sistem; posledica je meningitis in poškodba živcev s paralizo (slednja nastopi v manj kot 1 % primerov).