President Barack Obama has called on Congress to approve his request for $6.2 billion in emergency spending to confront Ebola in the countries experiencing the epidemic and secure the U.S. against any possible spread.

His request comes as lawmakers are winding down their session for the year.  

Obama, at a meeting with his Ebola response team at the White House, said the three countries, Guinea, Liberia and Sierra Leone, are "nowhere out of the woods" on fighting Ebola, and the disease remains a worldwide threat as long as the outbreak continues.

His comments come a day after surgeon Dr. Martin Salia, who contracted Ebola in his native Sierra Leone, died at a Nebraska hospital after being rush to the U.S. for aggressive treatment.

Dr. Moses Kargbo, a retired medical officer who had been volunteering in the Sierra Leone, died on Tuesday, according to The Associated Press. He is the seventh doctor to have died in Sierra Leone.

An Indian man who recovered from Ebola in Liberia has been placed in isolation at the New Delhi airport after traces of the virus were found in his semen, according to India's Health Ministry. When the man arrived at the New Delhi airport on Nov. 10, he carried a document confirming he had undergone Ebola treatment and was declared free of symptoms.

Blood samples taken from the 26-year-old man tested negative for the disease, which means he is considered to have recovered, according to the standards set by the World Health Organization and the U.S. Centers for Disease Control and Prevention (CDC). Further tests on his semen revealed the virus. The CDC advises survivors to avoid sex for three months or use condoms because the virus can continue to be found in semen for seven weeks after recovery from the disease. 

"The person concerned is a treated and cured case of Ebola virus disease," the Ministry of Health said in a statement. "All necessary precautions are being taken at the isolation facility. This would rule out even the remote possibility of spread of this disease by the sexual route."

There have been no reports of Ebola cases in India and throughout Asia. But concern over an outbreak is high, with the possibility of the disease quickly spreading where billions live in poverty and with the public health systems being inadequate and underfunded.

Thousands more physicians, especially epidemiologists and other health professionals, are needed to eradicate Ebola, European Union officials said Tuesday.

"We need these people to provide treatment and also to locate Ebola victims, guide them toward clinics, train local personnel, perform contact tracing, implement awareness programs," said Vytenis Andriukaitis, EU Health Commissioner, when speaking to journalists after returning from the afflicted countries.

Other pressing needs, Andriukaitis said, are mobile laboratories, public education leaflets and thousands of portable toilets necessary to improve sanitation and purity of the water supply.

Ebola has killed more than 5,000 people in the west African countries of Guinea, Liberia and Sierra Leone, many of them health workers. Doctors without Boarders said 24 of their staff members have been infected with the disease with nine surviving.