All are features of non paralytic polio except –

Poliomyelitis The usual age group affected by poliomyelitis is between 6 months to 3 years. Incubation period —> 7-14 days. Clinical manifestations Clinical course of Poliomyelitis has following stages. 1. Inapparent (subclinical) infection Occurs in 95% of infected individuals. Patient is asymptomatic 2. Minor (abortive) illness 1114-8% of infection. Fever, sore throat, headache adn malaise. Associated with phase of viremia. Lasts for 1 to 5 days ​ 3. Aseptic meningitis In 1% of infected cases. Signs of menigitis —> Neck rigidity, vomiting etc. 4. Paralytic polio In less than 1% of infections. Note : First 3 stages are non-paralytic polio.