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A survivor of the massive 2014-2016 West African Ebola outbreak almost certainly triggered an outbreak currently underway in Guinea, according to a new genetic analysis, news that has landed like a bombshell in the community of researchers who study the dangerous virus.

The analysis suggests that a survivor of the historic Ebola outbreak continued harboring the virus at least five years after being infected, eventually transmitting it to someone. Previously, the longest an Ebola survivor was believed to have shed the virus was about 500 days.

“I was completely shocked,” Angela Rasmussen, a virologist affiliated with the Georgetown Center for Global Health Science and Security, told STAT.