(GERMANY) -- The American doctor who contracted Ebola and was transferred to Germany is starting to feel better and is able to eat, according to his colleague.
Dr. Peter Stafford is currently hospitalized in Berlin's Charite University Hospital after testing positive for the disease due to his work in the Democratic Republic of the Congo.
His colleague, Matt Allison -- the executive director of Serge, the Christian missionary group Stafford works for -- told ABC News that the doctor has been receiving monoclonal antibodies during his hospitalization.
Allison said it appears Stafford's condition has improved since landing in Germany and that he has been able to text his colleagues.
"He needed assistance to walk. He was very weak. He was discouraged ... he was talking about just being almost unable to think," Allison said. "I mean [it] was the combination of the isolation, the uncertainty, feeling really sick. It was a lot to carry. And so I'm so glad that he's responding quickly to us."
Allison went on, "He feels good. He's eating. You know, one of the symptoms of Ebola is nausea and gastrointestinal issues, and so we're so grateful that he's able to eat now and we're really encouraged by where he's at right now."
Stafford, a 39-year-old board-certified general surgeon with a specialization in burn care, tested positive for Ebola after caring for patients in Bunia, in the eastern Democratic Republic of the Congo, before an outbreak was identified.
His wife, Dr. Rebekah Stafford, 38, and Dr. Peter LaRochelle, 46, a fellow missionary doctor, were potentially exposed to Ebola through their work at hospitals in the DRC, Serge said.
Peter Stafford's family will join him in Germany while LaRochelle is on his way to Prague.
"The complex, coordinated efforts of many government agencies and international health authorities resulted in Peter Stafford's safe transport and the protection of those involved in his transfer," Dr. Scott Myhre, Serge area director for East and Central Africa, said in a press release on Wednesday. "Serge leadership extends their deepest gratitude to all involved in Peter's care and is praying for all involved in the fight to end this ebolavirus outbreak for the good of the people of the DRC."
The Ebola outbreak in the eastern DRC had caused 139 suspected deaths with nearly 600 suspected cases as of Wednesday, according to the latest update from World Health Organization Director-General Dr. Tedros Adhanom Ghebreyesus.
"We expect those numbers to keep increasing, given the amount of time the virus was circulating before the outbreak was detected," Tedros said during a press briefing in Geneva.
Anais Legand, the WHO's technical officer for viral hemorrhagic fevers, said on Wednesday that the Ebola outbreak may have started a couple of months ago and that investigations are ongoing.
"Our priority is really to cut the transmission chain by implementing contact tracing, isolating and caring for all suspects and confirmed cases," she said
The WHO convened an emergency committee on Tuesday night, following Tedros' declaration of a public health emergency of international concern on Sunday -- one level below a pandemic in the United Nations agency's alert system.
It was the first time a WHO chief had declared such an emergency before convening the emergency committee. After the meeting, the committee agreed that the outbreak did not meet the criteria of a pandemic emergency, which was applied to the global COVID-19 outbreak.
The outbreak was first detected in the DRC's northeastern province of Ituri, with cases officially confirmed by the health ministry on May 15. It marked the 17th outbreak of Ebola virus disease in the DRC, which is Africa's second-largest country and its fourth-most populous nation.
The current outbreak is caused by the Bundibugyo virus, a rare variant of Ebola for which there are no approved vaccines or therapeutics and which requires different diagnostics than other variants. Case fatality rates for previous Bundibugyo outbreaks have ranged from 30% to 50%, according to the WHO.
Tedros said cases of Ebola have been reported in several urban areas of the eastern DRC amid the ongoing outbreak, including the major cities of Goma and Bunia, and that at least two cases and one death have been recorded in neighboring Uganda's capital, Kampala. Cases have also been reported among health workers, according to Tedros.
At least 51 cases have so far been confirmed in the ongoing outbreak.
The WHO chief warned that significant population movement in the region, which includes a high-traffic mining area, along with insecurity and intensified conflict in recent months increase the risk of further spread. The risks are high at the national and regional levels, but remain low globally, according to Tedros.
Dr. Satish K. Pillai, incident manager for the Centers for Disease Control and Prevention's Ebola response, confirmed at a CDC press conference on Tuesday that genetic testing from this outbreak shows it is similar to the "genetic fingerprints" from outbreaks in 2007 and 2012, meaning there are diagnostic tools available that can detect this strain of Ebola.
Pillai said on Monday that the agency had activated its Emergency Operations Center through its country offices in the DRC and in Uganda, and is deploying technical experts that have been requested from Atlanta headquarters.
The CDC said Monday that it is preparing to restrict entry for travelers arriving from parts of central Africa where an Ebola outbreak has been declared, in coordination with the Department of Homeland Security.
The risk to the U.S. general public remains low, Pillai said.
ABC News' Eric M. Strauss contributed to this report.
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