KINSHASA, Congo (AP) — New suspected cases of Ebola have been reported in parts of Congo that were previously unaffected, the government said Thursday, as the death toll in the country's latest Ebola outbreak reached 600.

According to the Congolese health ministry, suspected cases have now been recorded in the provinces of Tshopo and Haut-Uele, signaling the continued spread of the disease beyond the epicenter in Ituri.

A Congolese government report, published late Wednesday, said two new cases were suspected in Kisangani, in Tshopo province. The minister did not say how many cases were suspected in Haut-Uele. The total number of confirmed cases across the country has now reached 1,759.

The report said one of the two suspected cases in Tshopo was linked to the Nia-Nia health zone in Ituri province, where the first cases were reported, while the other case “has no apparent geographical connection to known outbreaks.” Authorities were investigating.

The Africa Centre for Disease Control said on Thursday that the latest outbreak is the fastest-growing Ebola outbreak on the continent.

The Congolese authorities declared a fresh Ebola outbreak on May 15, after the disease had been transmitting for weeks without official detection, according to the World Health Organization. The latest outbreak is caused by the rare Bundibugyo virus, which has no approved vaccine or treatment.

Last week, clinical trials for treatment began after researchers launched a highly anticipated study in the hope of fighting the virus.

Efforts to contain the virus have also been hampered by a funding gap, attacks on health centers, and an ongoing conflict in eastern Congo, the epicenter of the outbreak.

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Justin Kabumba reported from Goma, Congo.