Mathematical model suggests that US experts got their priorities wrong.Vaccinating very young children against swine flu should not be the top priority, a study suggests.Alamy The US policy for which groups should be the first to receive influenza vaccines is not the most effective strategy to limit the spread of swine flu, according to a paper published online today in Science1.Last month, a US Centers for Disease Control and Prevention (CDC) advisory panel recommended that young people aged from 6 months to 24 years old should be placed at the front of the queue for flu jabs. But a new...