According to BBC, the first person to be diagnosed with Ebola within the US has deteriorated from a serious to a critical condition, doctors in the state of Texas say.
Thomas Duncan, who caught the virus in his native Liberia, is being treated at a Dallas hospital in isolation.
Earlier it emerged that the flat where he lived is being cleaned by hazardous materials specialists and its remaining four occupants moved to a private home.
While Mr Duncan is the first person to be diagnosed within the US, three American aid workers and a photojournalist contracted the virus in Liberia.
Texas Health Presbyterian Hospital issued a six-word statement about Thomas Duncan on Saturday, saying only that "Mr Duncan is in critical condition.