Flu Attack! How A Virus Invades Your Body | Krulwich Wonders | NPR
Watch video Flu Attack! How A Virus Invades Your Body | Krulwich Wonders | NPR online without registration, duration 03 minute 39 second in high sd quality. This video was added by user NPR 23 October 2009, don't forget to share it with your friends and acquaintances, it has been viewed on our site 9 million once and liked it 45 thousand people.