There's a lot of debate about how long it might take before a successful COVID-19 vaccine is widely available.(Getty: Nicholas Asfour)ShareFacebookTwitterArticle share optionsShare this onFacebookTwitterLinkedInSend this byEmailMessengerCopy linkWhatsAppPrint contentPrint with images and other mediaPrint text onlyPrintCancelA post-coronavirus world depends on a vaccine. Without it, there's no returning to "normal life" anytime soon.Fortunately, scientists working on a COVID-19 vaccine have decades of scientific knowledge and technological advancements on their side.While vaccines usually take years or even decades to develop, after early breakthroughs some medical experts believed this one might be available in 12 to 18 months.Now, months later, human trials are even underway.What can the failures and successes of past vaccine research tell us about the challenges ahead?The first vaccinesThe military has largely driven the past century of vaccine research, says Arthur Allen, the author of Vaccine: The Controversial Story of Medicine's Greatest Lifesaver."After the last great pandemic,
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