In India, all ages have been affected, with the age group 15-34 years being the worst affected. The incidence has been low in children below 3 and people above 60 years of age [23] . The hospitalization rate was highest in children less than 4 years followed by the 5-24 year age group. Hospitalization was less common in 25-65 years age group and increased thereafter. This is unlike seasonal fl u infection where the elderly and young children are found to be at higher risk for fl u related complications [24] .