They argue that it would be better to concentrate on vaccinating those most likely to spread the virus—both schoolchildren and people between the ages of 30 and 40, who are likely to be the parents of those children, and who are, at the moment, at the bottom of the vaccination priority list.
Rather than vaccinating the elderly, pregnant women and infants, which is the traditional priority for vaccination a mathematical model suggests a more effective method. This focuses on those most likely to spread the flue rather than those mostly at risk. Applying this model to historical incidents it proves to be more effective. This also seems to be the recommendation of America's Centers of Disease Control for different reasons; the flue seems to effect young adults more than the elderly.