All are features of non paralytic polio except –
Absent deep tendon reflexes
Head drop
Nuchal rigidity
Knee heel test negative
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

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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.