Professor Ben Cooper from MORU in Thailand uses mathematical modelling and statistical techniques to help understand the dynamics of infectious disease and evaluate potential control measures. Antibiotic resistance is one of today's major global health problems. Mathematical models help us answer what if questions and evaluate the impact of specific interventions such as hands hygiene on the spread of bacterial drug resistance. Effective solutions are then translated into policy changes or changes in practice at national or international level. Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/