The World Health Organization (WHO) has declared Somalia free of polio. The UN Health agency announced that it had not recorded any case of polio disease in Somalia in the last three years. The declaration by WHO keeps Somalia outside the last group of countries which still record cases of polio in the world. Afghanistan, Nigeria and Pakistan are the remaining countries where polio is still being recorded. The WHO stated that Somalia recorded the case of polio in 2014 in the central part of the country. However, since then it has remained free of the disease.Poliomyelitis, often called polio, is an infectious disease caused by the poliovirus.