According to Mr Mamora, the directive became necessary as the country is unsure of when the next batch of the Oxford-AstraZeneca COVID-19 vaccines will arrive.
The Nigerian government has directed all states to halt COVID-19 vaccination once they utilise half of the doses allocated to them.
The Minister of State for Health, Olorunnimbe Mamora, disclosed this while speaking at the Presidential Task Force (PTF) on COVID-19 weekly briefing on Tuesday.
According to Mr Mamora, the directive became necessary as the country is unsure of when the next batch of the Oxford-AstraZeneca COVID-19 vaccines will arrive.
He said this will ensure those who have already received the first jab of the AstraZeneca vaccine get the necessary second jab.
"We believe that in a situation where we still cannot specifically determine when the next batch of AstraZeneca vaccines will arrive, then I think wisdom only dictates that we should vaccinate people fully," Mr Mamora said.
"So we can say that we have a pool of citizens that have been fully vaccinated since this vaccination comes in two doses."
Nigeria commenced COVID-19 vaccination on March 5 having received 3.94 million doses of the Oxford-AstraZeneca vaccines through COVAX, a UN-backed effort that promises access to vaccines for up to 20 per cent of participating countries' population
The vaccination started with healthcare workers who are often at the risk of exposure to infections being the first responders to patients.