Amur Tigers Boris and Svetlaya (IMAGE) Proceedings of the National Academy of Sciences Caption Samples collected from Amur tigers including Boris and Svetlaya (pictured) enabled the researchers to assess the population's exposure to canine distemper virus Credit Image credit: Wildlife Conservation Society 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.