Questions of cost-effectiveness, vaccine efficacy and feasibility are yet to be answered
In the United States, routine immunisation of all healthy children aged 6–23 months against influenza has recently been introduced. The principal justification for this is the relatively high morbidity and mortality from this disease in very young children.1 The United States is also considering routine influenza immunisation of all children aged over 6 months, in view of the herd protection it would provide to the adult population.
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