Forty percent of children aged between 12 to 23 months have not received any form of vaccine, according to the National Primary Healthcare Development Agency.

In the 2016/2017 National Immunisation Coverage Survey, which was released in Abuja on Thursday 10th August, the agency observes that 77 percent of the children did not receive all the routine immunisations.

The survey, conducted by the agency in partnership with development partners had conducted between August 2016 and January 2017, also shows that most states in northern Nigeria recorded a weak immunisation performance while southern states recorded substantial immunisation performance.

It attributes the weak immunisation performance in northern states to lack of awareness, mistrust, fears, service delivery issues and family issues.

However, no state in the country achieved the 90 percent performance set by the World Health Organisation.