The International Maize and Wheat Improvement Center (CIMMYT) is leading collective efforts to control the spread of Maize Lethal Necrosis (MLN) disease that appeared in eastern Africa in 2011 and is considered the worst threat to the region's food security in decades. Initiated in 2015 with support from the United States Agency for International Development (USAID), the MLN Diagnostics and Prevention of Seed Transmission project is pulling together national, regional and international partners to prevwnt the spread of MLN-causing Maize Chlorotic Mottle Virus (MCMV), support seed companies to produce MCMV-free commercial seed, soread improvement farming practices for disease control and create a 'community of practice' for disease diagnosis and management.