The Characteristics of Pandemic Pathogens (IMAGE) Johns Hopkins Center for Health Security Caption Researchers at the Johns Hopkins Center for Health Security find that a potential global catastrophic risk-level pandemic pathogen will most likely have a respiratory mode of transmission. Credit Johns Hopkins Center for Health Security Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.