A "contagious condition" refers to an illness or disease that can spread easily from one person to another through contact or close proximity. Full definition
Kennel cough is a highly contagious condition caused by one of a variety of different viruses or bacteria. (dogcare.dailypuppy.com)
Dogs arriving sick with or undergoing treatment for Distemper, Parvo, Upper Respiratory Infection, Kennel Cough, Coccidia, Giardia, Ringworm, Sarcoptic Mange or other contagious conditions will be NOT be allowed on transport. (yourtxrescueconnection.org)
• Bordetella:» Kennel Cough» is a broad term covering any infectious or contagious conditions in dogs where coughing is a feature. (ahna.net)