A female healthcare worker is the third British citizen to test positive for Ebola, which has killed around 10,000 people in Sierra Leone, Liberia and Guinea.

An estimated 700 British servicemen and women have been deployed to Sierra Leone to help in the response against Ebola, which swept through west Africa last year.
They have helped build and staff medical centres, along with a number of volunteers from Britain’s state-run National Health Service (NHS).
Two British nurses, Pauline Cafferkey and William Pooley, contracted Ebola but recovered after treatment in Britain.
Public Health England said an investigation was underway into how the unnamed military worker caught the virus, and anyone in recent contact with the patient was being traced.
"Any individuals identified as having had close contact will be assessed and a clinical decision made regarding bringing them to the UK," the spokesman added.
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Liberia last week discharged its last confirmed Ebola patient from hospital. No new case has been registered in the country since February 19.
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