Blood samples from pre-immune Amur tiger,African lion and lynx were collected and the antibody against CDV was measured by neutralization tests.

• 采取某动物园未免疫的东北虎、非洲狮、猞猁血样,用中和试验检测,结果显示这些动物的犬瘟热病毒(CDV)抗体水平均小于1:5。