KIGALI, Rwanda African health ministers from the Lake Chad Basin region launched a vaccination campaign Thursday aimed at protecting 83 million under-5 children against polio variant type 2 in a renewed effort to eradicate circulation of the disease in the region. Over the past 12 months, variant poliovirus type 2 has been detected both in the environment (wastewater samples) and among people in Cameroon, Chad, Niger and Nigeria, according to the World Health Organization (WHO). A synchronized