Tracking Influenza Virus Epidemics

Influenza viruses are unusual because we can become infected by a similar virus almost every year during our lifetime and occasionally there are worldwide pandemics that can cause many fatalities. Why does our usually excellent immune system fail us? How does this come about? In this public lecture, Arnold Levine, Professor Emeritus in The Simons Center for Systems Biology, School of Natural Sciences, explores the answers to these questions.