A Congolese refugee boy washing his hands before entering one of the medical tents used for evaluating newly arrived Congolese for potential symptoms of Ebola, at the Kyaka refugee settlement in western Uganda. Picture: Kellie Ryan/International Rescue Committee via AP
A Congolese refugee boy washing his hands before entering one of the medical tents used for evaluating newly arrived Congolese for potential symptoms of Ebola, at the Kyaka refugee settlement in western Uganda. Picture: Kellie Ryan/International Rescue Committee via AP
A young Congolese refugee girl washing clothes outside one of the medical units used for evaluating newly arrived Congolese for potential symptoms of Ebola, at the Kyaka refugee settlement in western Uganda. Picture: Kellie Ryan/International Rescue Committee via AP
A young Congolese refugee girl washing clothes outside one of the medical units used for evaluating newly arrived Congolese for potential symptoms of Ebola, at the Kyaka refugee settlement in western Uganda. Picture: Kellie Ryan/International Rescue Committee via AP
A Congolese refugee girl washing clothes outside one of the medical units used for evaluating newly arrived Congolese for potential symptoms of Ebola, at the Kyaka refugee settlement in western Uganda. Picture: Kellie Ryan/International Rescue Committee via AP
A Congolese refugee girl washing clothes outside one of the medical units used for evaluating newly arrived Congolese for potential symptoms of Ebola, at the Kyaka refugee settlement in western Uganda. Picture: Kellie Ryan/International Rescue Committee via AP
People crossing the border have their temperature taken to check for symptoms of Ebola, at the border crossing near Kasindi, eastern Congo, just across from the Ugandan town of Bwera. Picture: Al-hadji Kudra Maliro/AP
People crossing the border have their temperature taken to check for symptoms of Ebola, at the border crossing near Kasindi, eastern Congo, just across from the Ugandan town of Bwera. Picture: Al-hadji Kudra Maliro/AP
An Ebola screening checkpoint for people crossing from Congo at the Mpondwe border crossing, between the towns of Kasindi in Congo and Bwera in Uganda. Picture: Matthew Taylor/World Health Organization via AP
An Ebola screening checkpoint for people crossing from Congo at the Mpondwe border crossing, between the towns of Kasindi in Congo and Bwera in Uganda. Picture: Matthew Taylor/World Health Organization via AP
Police operate a checkpoint at the border crossing near Kasindi, eastern Congo, just across from the Ugandan town of Bwera. Picture: Al-hadji Kudra Maliro/AP
Police operate a checkpoint at the border crossing near Kasindi, eastern Congo, just across from the Ugandan town of Bwera. Picture: Al-hadji Kudra Maliro/AP
Local residents wash clothes and wade in the shallow Lubiriha River, an area that is popular with those who want to cross into Uganda without passing through the official border crossing, in Kasindi, eastern Congo, just across the border from the Ugandan town of Bwera. Picture: Al-hadji Kudra Maliro/AP
Local residents wash clothes and wade in the shallow Lubiriha River, an area that is popular with those who want to cross into Uganda without passing through the official border crossing, in Kasindi, eastern Congo, just across the border from the Ugandan town of Bwera. Picture: Al-hadji Kudra Maliro/AP

Kampala, Uganda - A second person infected with the Ebola virus has died in Uganda, the health ministry said Thursday, after a family exposed to the disease quietly crossed the border from Congo.

The first cross-border cases in this Ebola outbreak - the second-deadliest in history - have prompted a World Health Organization expert committee to meet on Friday to discuss whether to declare a global health emergency . Such declarations almost always boost attention and donor funding.

Uganda health ministry spokesman Emmanuel Ainebyoona confirmed the death of the 50-year-old woman overnight. Her 5-year-old grandson was the first confirmed death from Ebola in Uganda on Wednesday. The boy's 3-year-old brother also is infected.

Congo's health ministry said all members of the Congolese-Ugandan family have agreed to be repatriated to Congo for experimental treatments as part of clinical trials. There is no licensed treatment for the hemorrhagic fever which can spread quickly via close contact with bodily fluids of those infected and can be fatal in up to 90% of cases.

More than 1,400 people have died in this outbreak declared in August in eastern Congo, one of the world's most turbulent regions, where rebel attacks and resistance by community members wary of authorities have badly hampered Ebola containment work.

For months, officials have feared the virus would cross the heavily traveled border where health workers have been screening millions of people for fever and other symptoms. Uganda, Rwanda and South Sudan have been preparing for possible cases.

The family's case shows the challenges in tracking those infected in an outbreak where an alarmingly high percentage of cases aren't discovered until it is too late. Doctors Without Borders last month said

Authorities on Wednesday said the family had traveled from Uganda to Congo because the boys' grandfather was ill. WHO said he died of Ebola, and officials believe those who mourned him became infected, too.

While returning to Uganda, the group including several other children was stopped at a Congolese border post. A dozen members of the group already showed symptoms of Ebola. While awaiting transfer to an Ebola treatment unit, six family members slipped away and crossed into Uganda on an unguarded footpath, authorities told The Associated Press.

Authorities in both countries now vow to step up border security.

Uganda has now identified seven suspected Ebola cases, and about 50 contacts of the family are being traced there. Five family members who did not cross into Uganda have tested positive for Ebola, Congo's health ministry said.

Health teams in Uganda "are not panicking," Henry Mwebesa, the national director of health services, told the AP on Wednesday. He cited the East African nation's experience battling previous outbreaks of Ebola and other hemorrhagic fevers.

This outbreak "is not going to go beyond" the boy's family in Uganda, he added.

For the first time an experimental but effective

AP