All schools in Nigeria have been ordered to remain shut until 13 October as part of measures to prevent the spread of the deadly Ebola virus.
The new academic year was due to start on Monday.
But the education minister ordered the closures to allow staff to be trained on how to handle suspected Ebola cases.
Five people have died of Ebola in Nigeria. The West Africa outbreak has centred on Guinea, Liberia and Sierra Leone, killing more than 1,400 people.
It is the largest ever outbreak and has infected an estimated 2,615 people. About half of those infected have died.
It spread to Nigeria – Africa’s most populous country – in July, when a man infected with Ebola flew from Liberia to Lagos.
The head of the African Development Bank (AFDB), Donald Kaberuka, has called on airline companies to restart their services to the worst-affected countries.
Several African countries and airlines have banned flights to Guinea, Liberia and Sierra Leone despite World Health Organization (WHO) advice that travel bans do not work.
Air France has now announced it is suspending flights to Sierra Leone from Thursday, following a request by the French government.
The virus is not airborne and is spread between humans through direct contact with infected bodily fluids.
“It is very important that as you combat Ebola, we also continue to ensure that ordinary economic activity is not disputed,” Mr Kaberuka told BBC Africa on a visit to Sierra Leone.
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