The World Health Organisation (WHO) Tuesday said the Ebola virus-hit Nigeria and Guinea have showed encouraging signs to contain the outbreak.
"At present, 12 confirmed cases in Nigeria's Lagos city are all part of a single chain of transmission. Those infected by the initial case include medical staff involved in a treatment of the Liberian citizen, who brought the disease into the country, and a protocol officer in very close contact with the patient," Xinhua quoted a WHO statement as saying.
The situation in Guinea is also under control, the UN agency said.
The initial patient, from Liberia, arrived in Lagos July 20 and died July 25.
The outbreak began in Guinea in the first quarter of 2014 and rapidly spread to neighbouring countries like Liberia.