 Influenza morbidity affects the entire population and has an enormous impact upon the economic burden and the health care system, particularly causing serious illness among young infants 0-6 months of age. Recent studies show high rates of influenza illness and hospitalization among infants at this age group in industrialized countries Chiu et al., 2002; Poehling et al., 2006 and influenza related childhood mortality is highest in young infants before 6 months of age Bhat et al., 2005. Unfortunately, inactivated influenza vaccine is not recommended for this age group, but pregnant women can be vaccinated during 2nd - 3rd trimester. Thus the strategy of passive immunization from mother of infants is the effective way to combat this infection among young infants. This approach adopted in US since 1997 and recommended by WHO since 2005. 