The Ebola outbreak in the Democratic Republic of Congo made the long-feared jump across borders with three cases confirmed Wednesday in Uganda.
A 5-year-old Congolese boy who had the virus died while in Uganda, CNN reports.
The World Health Organization and Ugandan health authorities said the boy had traveled from Congo on Sunday and entered Uganda with his family and sought medical care.
The other two confirmed cases are the boy's 3-year-old brother and his grandmother, 50.
The Congo outbreak is both the second largest and second deadliest Ebola outbreak in history.
More than 1,300 people have died since it began in August.