Retroscreen Virology Group plc announced the signing of a Viral Challenge Model contract for evaluating modes of influenza transmission and better understanding how flu is spread. The study will be the ever investigation into influenza transmission and is a collaboration with the University of Nottingham and other international groups, funded by the United States Centers for Disease Control and Prevention (CDC). The contract is valued at £3.9 million and the study will commence in first half of 2013.