The rapid spread of Ebola in the Democratic Republic of Congo has created a "deeply alarming" situation, the medical charity Médecins Sans Frontières (MSF) has warned.
Speaking two weeks on from the outbreak being declared by the World Health Organization (WHO), MSF deputy director Dr Alan Gonzales said never before had "so many cases" been recorded so soon.
His comments came as WHO head Dr Tedros Adhanom Ghebreyesus, visited the eastern Congolese province of Ituri – the worst-hit area – to oversee virus containment efforts.
There are now more than 1,000 suspected Ebola cases in the DR Congo, and at least 246 deaths. Neighbouring Uganda has reported nine confirmed cases and one death.
"Two weeks after the declaration of the Ebola disease outbreak in Ituri Province, the situation is deeply alarming," Gonzalez said in a statement on Saturday.
"Never before has an Ebola outbreak recorded so many cases so soon after its declaration," he said, stressing his teams on the ground were "witnessing a response that has not yet caught up to the rapid spread of the epidemic".
"The reality today is that nobody knows the true scale and severity of this outbreak. New suspected cases are being reported daily, yet hundreds of samples remain untested."
Gonzalez added that containment efforts and humanitarian aid deliveries were being delayed by "major constraints", including border and airport closures.
The WHO has repeatedly warned that ongoing conflict in DR Congo was also significantly hampering the Ebola outbreak response.
After arriving in Ituri's provincial capital of Bunia on Saturday, Tedros said he and his team were in DR Congo "to see how the response is running and if there are challenges to help".
He urged communities in the centre of the outbreak to play a bigger role in fighting the disease, saying they "understand the problems better and they know the solution as well".
Tedros also said he understood how important it was for people to honour their dead at funerals – but warned that right now this was dangerous.
"Certain practices including touching of bodies of those who have died from Ebola, can spread the virus further. While we grieve for those we've lost, we must do everything we can so that we don't lose another, and get into a cycle of grief," he said.
Ebola viruses normally infect animals, typically fruit bats, but outbreaks among humans can sometimes start when people eat or handle infected animals.
Ebola spreads through direct contact with the bodily fluids of an infected person, including blood, vomit, diarrhoea, saliva, urine, semen and sweat. It can also be transmitted by touching contaminated objects such as needles, bedding or clothing.
Patients with Ebola need to be isolated in hospital, with treatment involving managing symptoms – such as help with breathing and fluids given directly into a vein to stop dehydration – according to the UK's National Health Service (NHS).
In Bunia, daily life appears largely unchanged. People continue to move around, trade and go about their normal activities.
On arrival at the city's airport, passengers are directed to hand washing stations where they are required to clean their hands with soap and water.
Public health advisories are displayed in parts of the airport, while information is also being broadcast on radio and television. These messages are being delivered in local languages as well as in French, the DR Congo's official language.
One of the WHO head's first stops was the National Institute for Biomedical Research laboratory in Bunia, where samples from suspected Ebola patients are tested.
Local health officials say the facility is now able to return results within 24 hours, helping doctors quickly identify infections and begin treatment.
Until recently, samples had to be transported more than 1,500km (932 miles) to DR Congo's capital, Kinshasa, causing delays that health workers feared could cost lives and allow the virus to spread further.
In a separate development, health officials in Brazil said on Saturday that they were investigating a suspected Ebola case in São Paulo state.
Brazilian media report that a 37-year-old man – who had recently returned from DR Congo – was now in isolation in an infectious diseases institute.
The current outbreak, a rare strain of Ebola known as Bundibugyo, has no proven vaccine and kills about a third of those infected.
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