A person who died in a suspected case of Ebola in southern Nigerian city of Calabar, did not have the deadly virus, said the World Health Organization. The country was declared free of the deadly disease a year ago.
Ten people have been quarantined after coming into contact with the man with Ebola-like symptoms. He died shortly after being admitted to hospital in Calabar, said officials.
WHO's spokesman Gregory Hartl later confirmed the man had tested negative for Ebola and Lassa fever.
On October 7, the three West African countries affected by Ebola - Guinea, Sierra Leone and Liberia - recorded their first week with no new cases since the outbreak began in March 2014.
New cases of Ebola have fallen sharply in 2015. However, the WHO has warned that the disease could break out again.
The latest Ebola scare happened when a patient arrived at the University of Calabar Teaching Hospital on October 7.
"Those quarantined included nurses who had attended to the patient," said Queeneth Kalu, the hospital's chief medical director.