@CNN: Even when just 20% effective, flu vaccine saves tens of thousands of lives https://t.co/USd0F6t6xA https://t.co/c5CRhCMGKZ
Even when just 20% effective, flu vaccine saves tens of thousands of lives https://t.co/USd0F6t6xA pic.twitter.com/c5CRhCMGKZ
— CNN (@CNN) May 1, 2018