For the first time in decades, vaccines are having a moment. Will it last? People await polio vaccine outside a stadium in Evansville, Ind., in August 1959. AP Rupali Limaye got her first dose of Covid-19 vaccine a couple of weeks ago. “I bawled,” she admitted without the slightest hint of embarrassment. It so happens that Limaye is a staunch proponent of vaccination; she works at the International Vaccine Access Center at Johns Hopkins University. But her reaction is not uncommon. Talk to anyone working in or volunteering at Covid vaccination clinics, and you’ll hear tales about the joy, the relief, the shedding of the cloak of dread that has weighed people down during our difficult period of pandemic isolation.