But Dr. J. Donald Millar, a former head of the smallpox eradication program at the centers, said health officials and other experts like himself could not determine the extent of the risk of a smallpox attack, and he challenged the government to provide its evidence.
"I think the future is openness to the point of the eradication of government.
Bruce Aylward, head of the WHO's polio eradication campaign, said: "Over the last 24 months on three continents - in Europe, in Africa and in Asia - we have seen horrific explosive outbreaks of the disease that affected adults, and in some cases 50% of them died.
Yet as Donald Henderson, head of the World Health Organisation's (WHO) global smallpox eradication programme, who has died aged 87, left the celebrations in order to catch a flight to Bangladesh, he received word that the borders were closed.
In rebel-held areas of northern Mali, teams that remove worms and teach villagers how to protect their drinking water have been unable to operate since April, Ernesto Ruiz-Tiben, head of Guinea worm eradication for the Carter Center, said during a video news conference with Mr. Carter.
"You have to be very careful about the hope you have for eradication with this," says Anthony Fauci, head of the National Institute of Allergy and Infectious Diseases (NIAID) in Bethesda, Maryland.
"The richer farmers can pay bribes to avoid eradication, while the poorer ones can't," said Abdul Manan, head of the government's counter-narcotics department in Helmand.
The head of the UN children's agency also announced the allocation of over $5 million to contribute to polio eradication efforts in Nigeria.
The title of the first, The Eradication of Schizophrenia in Western Lapland, describes a true phenomenon.
Finlay's hypothesis and exhaustive proofs were confirmed by the board's head, the US army doctor Walter Reed, paving the way for the eradication of yellow fever and saving generations of lives throughout South America, the Caribbean, Africa and the southern US.
