Evolution of H5N1 (IMAGE) Duke-NUS Medical School Caption H5N1 was first detected in geese in Guangdong, China. From there it has evolved into a highly pathogenic virus that has caused deadly outbreaks in humans and birds, and more recently it has spread into new hosts including pinnipeds like sea lions and cows Credit Yvonne Su, Duke-NUS Medical School Usage Restrictions Credit: Yvonne Su License Original 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.