The blood from 2007 outbreak survivors is used for research to use antibodies to fight against Ebola virus.
Another Ebola case has been reported, just a day after West Africa has been declared Ebola-free.
A senior health official from Guinea announced on Saturday that the last 68 people who have come in contact with an Ebola patient has been released from quarantine.
Sierra Leone has been declared Ebola-free by the World Health Organization, ending nearly 17 months of outbreak in the country.
The World Health Organization announced Friday that there were two confirmed cases of Ebola in Guinea.
A child from Bamako, Mali has been paralyzed by a vaccine-derived polio virus. It is the country's first polio case in over four years according to the World Health Organization.
Liberia is once again free from Ebola for the second time this year, the World Health Organization declared on Thursday.
