The outbreak has mostly affected children in Africa’s most populous country.

As at May 9, a total of 13,420 suspected cases were reported in 23 states with 1,069 deaths; giving a fatality ratio of eight percent, the CDC said in a statement.

The northern states of Zamfara, Sokoto, Katsina and Kebbi, which were the worst affected, have all seen a drop in the number of cases.

Two others which were also badly hit - Kebbi and Niger recorded no deaths.

A new strain of meningitis C was first reported in Zamfara last November and spread to 22 other states in northern Nigeria. 

A mass vaccination programme was started to limit its spread.

The CDC said a new batch of vaccines are expected to arrive in a few days.

Meningitis is caused by different types of bacteria, six of which can cause epidemics. 

It is transmitted between people through coughs and sneezes, close contact and cramped living conditions.