The hospital in Liberia where three American aid workers contracted Ebola has been overwhelmed by a surge in patients, one of the US victims who survived the deadly virus said.
Missionary workers Nancy Writebol and her husband David said the facility does not have enough hazard suits and other supplies to keep doctors and nurses safe.
Mr Writebol said: "We don't have enough personal protective safety equipment to adequately be able to safely diagnose if a patient has Ebola so they are putting themselves at risk."
The latest infection of Dr Rick Sacra, an obstetrician who was not even working in the hospital's Ebola unit, shows just how critical protective gear, the couple added.
A Swansea doctor who took leave to treat Ebola patients in Africa, is back on the wards after three weeks in isolation.
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In a Facebook Q&A on the Ebola virus for ITV News, an expert discussed risks, potential vaccines and what would happen if it came to the UK.