In this Aug. 8, 2018, file photo, a health care worker from the World Health Organization gives an Ebola vaccination to a front line aid worker in Mangina, Democratic Republic of Congo. The Ebola outbreak in eastern Congo, the second deadliest in history, marks six months on Friday and is moving toward the major border city of Goma, a development that would greatly complicate any hope of stopping the virus’ spread in the unstable region. (AP Photo/Al-hadji Kudra Maliro, File)
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