"we were quite surprised to find there were no significant differences," says study author .
"the hospital � i don't know what to say. everyone was amazing," he said. .
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the outbreak killed 20 and sickened 577 people between november 2016 and october 2017. .
"we were quite surprised to find there were no significant differences," says study author .
"the hospital � i don't know what to say. everyone was amazing," he said. .
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