In the early spring of 2009, a new strain of H1N1 influenza emerged and swept across the globe more rapidly than vaccine producers could keep pace. By the time the pandemic abated in February 2010, the US Centers for Disease Control (CDC) estimated that between 8,500 and 17,600 Americans had died from H1N1 infection, with a disproportionate number of deaths occurring among healthy children and young adults. An estimated 15–25% of the nation’s population was exposed to the…