The country, which reports more than 2,000 new cases a year ran out of supplies partly because drugs were held up after new regulations were introduced.

The WHO said it had asked Nigeria to briefly lift its new testing policy and it expects the drugs to arrive from India on Sunday. Leprosy is curable with a combination of different antibiotics, but if left untreated the patients' health can deteriorate with sores and nerve damage that cause deformities. The treatment can last between six and 12 months.

But because of the lack of drugs in Nigeria, patients have been sent home from hospitals. As the drugs suppress transmission this increases the risk of the disease spreading. Dr Samimu Msheliza, a public health expert and medical advisor at the Nigerian branch of the Leprosy Mission, highlighted the urgent need for medication. "We have thousands of newly diagnosed leprosy patients across various cities who are just waiting for this drug," he told the BBC.

"The quicker we have [the drugs], the better, because currently these people are suffering, their transmission is ongoing because they are not being treated," Dr Msheliza said. The Reuters news agency spoke to one woman at a hospital in Nasarawa state, who said her condition had gotten much worse since she was not able to get hold of the combination of drugs.