A British man has tested positive for Ebola in the Democratic Republic of Congo.
He is expected to be flown back to the UK for treatment following the diagnosis.
A Government spokesperson said: "A British citizen currently in the DRC has tested positive for Ebola.
"The UK has well-established procedures for dealing with cases like this, and those processes have been activated."
The patient, identified by Reuters as a healthcare worker, is expected to be medically evacuated to the UK, though the timing of the flight remains unclear.
Only four cases of Ebola have ever been confirmed in the UK, including three involving health workers who responded to the outbreak in West Africa between 2014 and 2015.
Dr Damien Tully, associate professor at the Medical Research Council/Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine Uganda Research Unit, said: "This case is a stark reminder of the risks faced by those responding to the outbreak of Ebola disease caused by Bundibugyo virus in the DRC.
"However, it does not suggest that the virus has become more transmissible or that the threat to the UK has increased."
Dr Tully described the infection as "deeply concerning, but it is not entirely unexpected."
He said: "Healthcare workers are on the front line of these outbreaks, often treating severely ill patients under extremely challenging conditions.
"Even with rigorous protective measures, accidental exposures can occur."
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He stressed that the risk to the British public "from this planned medical evacuation is extremely low" because Ebola is "transmitted primarily through direct contact with infected bodily fluids, and people are not generally infectious until they develop symptoms."
The UK has two high-level isolation units equipped to handle such cases – at the Royal Free Hospital in London and the Royal Victoria Infirmary in Newcastle.
Dr Tully said: "These facilities are equipped with specialist isolation systems and staffed by highly trained infectious disease teams."
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