S2Ep6: How to Outpace a Killer Virus

In this episode, we explain why influenza is such a persistent threat—its segmented RNA genome enables antigenic drift and reassortment-driven “shift,” letting it change faster than traditional vaccines can be manufactured. We thenwalk through Petsch et al. (2012), showing that synthetic mRNA vaccines elicit functional anti-HA antibodies measured by HAI, protect mice from lethal influenza challenge (with protection transferable by antibody), and cangenerate remarkably durable immunity—highlighting the real breakthrough: turning vaccine development from slow biological manufacturing into speed-of-information medicine.