@CNN: Even when just 20% effective, flu vaccine saves tens of thousands of lives https://t.co/USd0F6t6xA https://t.co/c5CRhCMGKZ

@CNN: Even when just 20% effective, flu vaccine saves tens of thousands of lives https://t.co/USd0F6t6xA https://t.co/c5CRhCMGKZ