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In the U.S., two types of influenza vaccine are approved for children: injectable trivalent inactivated vaccine (TIV) for those aged >6 months and inhaled live attenuated vaccine for those aged >2 years. TIV is not as immunogenic and protective in young children as in older individuals, but it is the only choice for children aged 6 months to 2 years. Adjuvanted vaccines hold promise for improving effectiveness, and influenza preparations containing an oil-in-water emulsion — although not approved in the U.S. — have been used in other countries. In a recent manufacturer-sponsored study conducted in Finland and Germany, researchers studied the effect of adding one such emulsion, MF59, to TIV.
During the 2007–2008 and 2008–2009 influenza season…