The current Ebola outbreak may be starting to wane, but scientists agree they'll need a stockpile of vaccines to tackle the next one. And that means developing next-generation shots that can fight off multiple strains. "We need to work with the pharmaceutical industry to create second-generation vaccines that would cover not just Ebola Zaire but also Ebola Sudan and perhaps Marburg, perhaps Lassa. The idea is to have vaccines that will work across different places," GAVI CEO Seth Berkley told Reuters. More