Influenza Immunization for Children

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Abstract
Influenza continues to be a major cause of morbidity and mortality, despite intensive efforts to vaccinate persons at high risk. In the United States, the annual rates of influenza range from 10 to 20 percent in the general population and may reach as high as 40 percent in children. This past winter, a strain of influenzavirus previously believed to cause disease only in birds was responsible for illness and several deaths in Hong Kong and led to a massive public health initiative.1 In North America, a strain of influenzavirus that was not included in this year's vaccine circulated widely, reducing . . .