CDC Flu Plan Protects High-Risk Patients WASHINGTON - Many of the nation's scarce remaining flu shots will be shipped directly to pediatricians, nursing homes and other places that care for high-risk patients, under a plan negotiated between the government and maker Aventis Pasteur.    The targeted shipments come as health officials struggle to ensure the people who most need flu shots get them, now that the nation's supply of influenza vaccine has been slashed in half...