The CDV Antigen Rapid Test Cassette is a qualitative lateral flow immunochromatographic assay for detection of antigens of Canine Distemper Virus (CDV). The test cassette has a testing window. The testing window has T (test) region and C (control) region. During testing, sample is applied into the sample well on the cassette. CDV antigens, if present in specimen, react with the pre-coated anti-CDV antibodies in the test strip. The mixture then migrates upward on the membrane chromatographically by capillary action and reacts with anti-CDV antibodies on the membrane in the test line region. If the specimen contains Canine Distemper Virus, a colored line will appear in the test line region indicating a positive result. If the specimen does not contain CDV antigens, a colored line will not appear in the test line region indicating a negative result. To serve as a procedural control, a colored line will always appear in the control line region indicating that proper volume of specimen has been added and membrane wicking has occurred.