Six cases have been detected in the country this month bringing to 21 the number of confirmed infections this year, the authorities said.
Experts say it is possible that the virus can be caught by eating meat from an infected animal. But this is not the most common transmission route.
Monkeypox, a mild viral infection, is endemic in Nigeria.
It occurs mostly in remote areas, near tropical rainforests.
The country has had sporadic cases since an outbreak in 2017. The virus was found mainly in the south of the country but, since 2020, it has spread to central, eastern and northern areas, the World Health Organization says.
Out of the 21 confirmed cases this year, there has been one reported death of a person who had underlying conditions. But earlier this week the health authorities said “there has been no evidence of any new or unusual transmission of the virus, nor changes in its clinical manifestation documented”.