A doctor who quarantined herself for three weeks after helping to treat Ebola patients in Africa has returned to work, with a stark warning that the situation is spiralling out of control.
Specialist registrar Nathalie MacDermott, who works at the neonatal unit in Singleton Hospital in Swansea, said being there felt like "sitting on a time bomb".
She flew to Liberia with charity Samaritan's Purse to care for people affected with the deadly virus.
Of the 50 to 100 patients she treated while out there, she said, just three survived.
It felt like we were sitting on a time bomb which was slowly exploding under us and there was nothing we could do.
It's hard for a doctor to know that they won't be able to save the vast majority of their patients, but I already knew that when I went to Liberia.
There is so much work to be done and if I could get leave I would definitely go out there and help again. They need healthcare staff to not only care for patients but help to contain the spread of infection.
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