(DEMOCRATIC REPUBLIC OF CONGO) — At least 60 people have died and over 1,000 more have been sickened by a deadly “unknown disease” spreading in a region of the Democratic Republic of Congo, the World Health Organization said.

Local health officials in Congo are partnering with the World Health Organization to investigate.

The phrase “unknown disease” primarily means that the disease has not yet been identified.

In previous cases, the cases are linked to a known disease, but a lack of available testing leads to lack of certainty.

For example, there was a separate report of an “unknown disease” in December of last year in Congo that was later attributed to illnesses from malaria and respiratory illnesses.

Local health officials have identified a surge of cases and deaths three times in different areas of the country in recent months.

A total of 1,096 sick people have been identified along with 60 deaths. Symptoms include fever, headache, chills, sweating, stiff neck, muscle aches, multiple joint pain and body aches, a runny or bleeding from nose, cough, vomiting and diarrhea.

Initial lab tests have been negative for Ebola and Marburg. Around half of samples tested have been positive for malaria, which is common in the area. Tests continue to be carried out for meningitis. Officials are also looking into food and water contamination.

Early investigations traced the outbreak’s origin to three kids, all under 5 years old, who developed symptoms after eating a bat carcass.

Symptoms included fever, headache, diarrhea and fatigue – which later progressed to signs associated with hemorrhagic fevers and death.

“The remote location and weak healthcare infrastructure increase the risk of further spread,” the WHO notes in its report.

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