The child, who had been vomiting blood, was receiving treatment in western Uganda after his family entered the country from Congo.
He died overnight, according to an official.
Two more cases of Ebola have been detected in Uganda after the family entered the country.
Those with the virus are believed to be relatives of the boy.
The child’s mother had returned to Congo to nurse her father who died of the disease, the health minister said on Tuesday.
The World Health Organisation has confirmed that the boy is the first Ebola case outside Congo since the latest outbreak began in August 2018.
Nearly 1,400 people have died in what has become the second-deadliest outbreak of the virus in history.
Authorities in Congo are trying to determine how the boy’s family, who were exposed to the Ebola, managed to cross into Uganda.
Congo’s health ministry has said dozens of members of the family had showed symptoms of the virus and were put in isolation.
But six managed to leave while awaiting transfer to an Ebola treatment centre.
Authorities say they entered Uganda where they have since been isolated.
Experts have long-feared the virus could spread to neighbouring countries because of unrest hampering response work in Congo, one of the world’s most unstable regions.
Ebola can spread quickly via close contact with bodily fluids of those infected and can be fatal in up to 90% of cases.
Henry Mwebesa, a physician and the national director of health services in Uganda, has said health teams “are not panicking”.
He added that the virus in Uganda “is not going to go beyond” the patient’s family.
The Congolese family are not likely to have passed through official border points, where health workers screen all travellers for a high temperature and isolate those who show signs of illness.
Uganda is more stable than eastern Congo and for the first time an experimental but effective Ebola vaccine is being widely used, with more than 130,000 doses distributed.
Ebola has been especially feared in the country, where multiple outbreaks have occurred over the years.
An outbreak in the north in 2000 infected 425 people and killed more than half of them.
Social media posts falsely suggested the virus had arrived in Texas with immigrants arriving from Africa, including Congo, where the outbreak has surpassed 2,000 cases.
The false claims, ranging from there is an Ebola “outbreak” in Texas to reports of a few confirmed cases, have been circulating since April.
US has imposed sanctions on Iran’s central bank after drone attacks in Saudi Arabia, says Trump | US News
President Donald Trump says the US has imposed sanctions on Iran’s central bank following last weekend’s attacks on Saudi oil facilities.
Speaking in the Oval Office on Friday during a meeting with Australian Prime Minister Scott Morrison, the US leader said: “We have just sanctioned the Iranian national bank.”
He did not give any other details about the sanctions.
US Treasury Secretary Steven Mnuchin told reporters that the bank was Tehran’s last source of funds.
When Mr Trump was asked about the possibility of a military response on Iran, he said that a military strike was always a possibility and that the US was prepared.
Evacuation Of Nigerians Has Discouraged Tourists, Others To South Africa, Says Air Peace Boss
Chairman of Air Peace, Mr Allen Onyema, has said that the evacuation of Nigerians from South Africa had led to a drastic reduction of tourists and air travellers to that country.
Onyema made the statement in Lagos on Wednesday evening while speaking with journalists during the arrival of the second batch of Nigerians evacuated from the former apartheid nation in the wake of latest xenophobic attacks on African migrants.
In total, 315 Nigerians returned from South Africa aboard Air Peace, bringing the total number of returnees to 493 out of over 600, who expressed their desire to return home following the latest xenophobic attacks.
The first batch had landed in the country last Wednesday with 178 returning with the Air Peace aircraft that airlifted them from South Africa.
Chairman, Nigerians in Diaspora Commission, Abike Dabiri-Erewa, was on the ground to receive the returnees including a representative of the Lagos State Government.
Nigeria’s Muhammad-Bande finally takes over as UN President
The ceremony, held inside the General Assembly Hall of the UN headquarters in New York, marked the end of the 73rd session .
The 74th session will formally begin on Tuesday with the inauguration of Muhammad-Bande, who is the Permanent Representative of Nigeria to the UN.
The handover ceremony was witnessed by top officials of the UN led by the Secretary-General, Antonio Guterres.
Nigerian officials, including a presidential team, comprising the Director-General, National Intelligence Agency (NIA), Mr Ahmed Abubakar, and presidential spokesman, Mr Garba Shehu, also witnessed the ceremony, NAN reports
In a short address, Guterres lauded Espinosa for her strong leadership, describing her as a “champion for multilateralism”, who made the UN “relevant to all”.
“I commend her ambitious priorities for this session, which addressed crucial matters of international impact and concern.
“These include gender equality, migration and refugees, decent work for all, environmental protection, the rights of people with disabilities, promoting the voices of young people to advance peace and security, and revitalising the work of the United Nations.
“The commitment of Espinosa to the environment especially ending plastic pollution also stands out,” he said.
The UN chief said he looked forward to working with Muhammad-Bande to advance the organisation’s mission of building more peaceful and prosperous world.
Earlier in a valedictory press conference, Espinosa said she was satisfied with her achievements within her one-year tenure.
She said her practice of formally reporting back to member states every three months, was very useful, especially for the smaller missions that could cover all the agenda items.
Espinosa said during the 73rd Session, no fewer than 341 resolutions were adopted, making it the highest number in several years.
She reiterated her call on member states to “read the resolutions we have adopted again and let´s deliver and implement them using this norm-setting power of the General Assembly”, she said.
Espinosa is the fourth woman to hold the office of the President of the General Assembly.
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