Kennel Cough

(continued)

For part 1 of this article, see:
Kennel cough symptoms and treatment

Vaccination and prevention

The best prevention is to not expose your dog to other dogs, especially young puppies. If this cannot be avoided, then proper vaccination is the next best option. Chances are that if your dog is regularly vaccinated with a standard 5-way or 7-way vaccine, he is already being protected against several of the agents causing tracheobronchitis, mainly parainfluenza and adenovirus. However, these vaccines alone rarely provide protection against contracting the disease, although they will help reduce the severity of the disease if the animal becomes infected.

More commonly, for best protection, an intranasal vaccine containing both parainfluenza and Bordetella is used. Intranasal vaccines create localized immunity that greatly reduces the incidence of clinical signs and illness. There are several precautions and warnings that need to be observed pertaining to this vaccine. Some dogs will develop mild signs similar to tracheobronchitis when given this vaccine. Very often, the symptoms will last for several days and the dog will recover without treatment. Dogs that are vaccinated can also shed the virus and cause other dogs to become mildly infected and show mild signs. This shedding usually lasts less than 72 hours. In addition, it takes up to 4 days after vaccination for dogs to develop protection. When you combine these facts, you will see why I strongly recommend that a dog not be given intranasal vaccine within 72 hours of coming into contact with other susceptible dogs. Do not give the vaccine the day before a dog show, boarding, etc. Try to give at least four days before contact with other dogs, and preferably 7 days. This way you will protect your dog from becoming infected by other dogs, and protect those dogs from becoming infected by yours.

This vaccine is not without its problems. It is a very effective vaccine, but it must be used carefully and is generally only recommended for dogs that are at high risk. If your dog is not shown, boarded, or comes into contact with stray dogs, your dog is considered low risk.

In kennels where tracheobronchitis is a problem, strict hygiene with thorough cleaning and disinfection of cages and food and water containers is essential. In addition, kennels that are indoors should have good ventilation with an air turnover rate of at least 12 times an hour. Agents causing tracheobronchitis can be transmitted on hands and clothing as well as through the air, so infected animals must be isolated and handlers should wear gloves and use proper handwashing to help prevent spread. Vaccination of all animals, especially puppies is indicated in problem kennels. After initial vaccination as puppies, a yearly booster is recommended. However, some dogs that are at very high risk are vaccinated every six months.

Human health risk

Until recently, infectious tracheobronchitis was considered to not be a human health risk. Recently however, research indicates that Bordetella bronchiseptica may cause disease in some humans, primarily those with compromised immune systems. In normal, healthy adults there does not appear to be a risk factor, but young children and immunocompromised individuals should take precautions against coming into contact with animals that have symptoms of tracheobronchitis.

Summary

'Kennel Cough,' now more commonly referred to as 'infectious tracheobronchitis' is a widespread disease caused by several different viruses and bacteria. It is usually a self-limiting disease and most animals do not require treatment. Intranasal vaccines are effective, but due to some possible side effects, are recommended for animals that are at higher risk. Infectious tracheobronchitis is a disease of dogs and wild canids, it does not appear to be a risk to healthy humans or cats.

References and Further Reading

Ettinger, S. Textbook of Veterinary Internal Medicine. W,B. Saunders Co. Philadelphia, PA; 1989.

Foster, R.; Smith, M. What's the Diagnosis. Macmillan. New York, NY; 1996.

Greene, C. Infectious Diseases of the Dog and Cat. W.b. Saunders Co. Philadelphia, PA; 1998.