Health workers in Nigeria have started a mass vaccination programme to try and stop an outbreak of meningitis.
More than 300 people have died of the disease since late last year.
Health workers are focusing their efforts on the north-western state of Zamfara – the centre of the outbreak.
Nigeria’s Centre for Disease Control says 500,000 vaccinations will be administered.
Health officials say they are almost 3,000 suspected cases of meningitis. So far the most affected group of victims has been children aged five to 14.
One official told the BBC that the response to the outbreak was hampered by a shortage of vaccine doses.
The predominant strain of meningitis causing this outbreak is type C, which is unusual in Nigeria.