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The World Health Organization (WHO) congratulates Niger for having met the criteria for onchocerciasis elimination, making it the fifth country globally and the first country in Africa to be acknowledged by WHO for interrupting transmission of the parasite Onchocerca volvulus.
Eliminating a disease is a significant achievement that requires tireless dedication,” stated Dr Tedros Adhanom Ghebreyesus, WHO Director-General. “I congratulate Niger for its commitment to liberating its population from this blinding, stigmatizing illness that causes so much human suffering among the poorest. This success is yet another testament to the remarkable strides we have made against neglected tropical diseases and offers hope to other nations still battling onchocerciasis, demonstrating that elimination is possible.”
Onchocerciasis, commonly known as river blindness, is a parasitic disease and is the second leading infectious cause of blindness worldwide, after trachoma. It is transmitted to humans through the bites of infective black flies, primarily found in riverine areas. The disease primarily affects rural populations in sub-Saharan Africa and Yemen, with smaller endemic areas found in parts of Latin America.
Between 1976 and 1989, under the umbrella of the WHO Onchocerciasis Control Programme in West Africa (OCP), Niger undertook vector control measures by spraying insecticides that significantly decreased levels of onchocerciasis transmission. Following the donation of ivermectin by Merck, Sharpe & Dohme (MSD), areas still affected by lymphatic filariasis (LF) underwent mass drug administration (MDA) with ivermectin and albendazole from 2008 to 2019, followed by surveillance. Since ivermectin is effective against both diseases, and areas targeted for LF MDA were also endemic for onchocerciasis, this intervention also contributed to interrupting the transmission of the Onchocerca volvulus parasite.
Dr. Yao Sodahlon, director of the Mectizan Donation Program, stated, “Niger has proven that what was once thought impossible is possible. Mectizan was donated to control river blindness 37 years ago. Today, we know that elimination of transmission is possible, which will permanently end the suffering caused by the disease in Africa. We applaud the commitment of the government of Niger and the supporting partners, as well as the community health workers whose dedication ensured that Mectizan reached the people who needed it.”
Niger joins four other countries that have been verified by WHO for eliminating onchocerciasis, all in the Region of the Americas: Colombia (2013), Ecuador (2014), Guatemala (2016) and Mexico (2015).
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