A Nigerian health official says that a suspected 489 people have died during the latest meningitis outbreak to hit Nigeria.
At least five northern states Sokoto, Zamfara, Katsina, Kebbi, Niger and the Federal Capital Territory have been affected by the epidemic over the past five months
Nigeria has started a large-scale vaccination programme in response to the mass outbreak that has affected mostly children.
Ehanire said that an ongoing vaccination campaign is yielding positive results.
Meningitis is caused by different types of bacteria, six of which can cause epidemics.
It is transmitted between people through coughs and sneezes, and facilitated by cramped living conditions and close contact.
The illness causes acute inflammation of the outer layers of the brain and spinal cord, with the most common symptoms being fever, headache and neck stiffness.