Over 40 people have died in a growing Ebola outbreak in the Democratic Republic of the Congo and Uganda, where government and international aid organizations are struggling to cope with the spread of the disease.

Subscribe to read this story ad-free

Get unlimited access to ad-free articles and exclusive content.

The current strain of Ebola, the Bundibugyo virus, is “a severe and often fatal form” of the disease, according to the World Health Organization. It has no approved treatment or vaccine.

The World Health Organization and the Africa Centres for Disease Control and Prevention both reported 43 confirmed deaths across the countries as of Saturday, including 42 in Congo and one in Uganda, according to the WHO. However, 349 people are suspected to have died from the virus in Congo and Uganda.

There are 272 confirmed cases of the disease in both countries, with 263 in Congo and nine in Uganda, the WHO reported. The Africa CDC has reported a total of 263 confirmed cases across Congo and Uganda, with more than 1,100 suspected cases still under investigation.

The source of the virus is believed to be the fruit bat, and human infection can occur through contact with secretions from infected wildlife, according to the WHO. It then spreads from person to person through the same method, and can be amplified by burial practices that involve contact with the deceased and inadequate infection prevention and control in healthcare settings.

On Saturday, WHO Director-General Tedros Adhanom Ghebreyesus visited the city of Bunia in Congo, the epicenter of the outbreak in the country’s Ituri province. Tedros advised against unsafe burial practices and urged countries to reconsider travel bans and border closures, saying they “discourage transparency.”