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What is canine influenza (dog flu)?
Canine influenza (also known as dog flu) is a contagious respiratory disease in dogs caused by specific Type A influenza viruses known to infect dogs. These are called “canine influenza viruses.” No human infections with canine influenza have ever been reported. There are two different influenza A dog flu viruses: one is an H3N8 virus and the other is an H3N2 virus.
Can canine influenza viruses infect humans?
To date, there is no evidence of transmission of canine influenza viruses from dogs to people and there has not been a single reported case of human infection with a canine influenza virus.
However, influenza viruses are constantly changing and it is possible for a virus to change so that it could infect humans and spread easily between humans. Human infections with new influenza viruses (against which the human population has little immunity) are concerning when they occur. Such viruses could present pandemic influenza threats. For this reason, CDC and its partners are monitoring the canine influenza H3N8 and H3N2 viruses (as well as other animal influenza viruses) closely. In general, canine influenza viruses are considered to pose a low threat to humans.
Where did canine influenza viruses come from and how long has it been around?
Canine influenza H3N8 virus originated in horses, spread to dogs, and can now spread between dogs. The H3N8 equine influenza (horse flu) virus has been known to exist in horses for more than 40 years. In 2004, however, cases of an unknown respiratory illness in dogs (initially greyhounds) were reported in the United States. An investigation showed that this respiratory illness was caused by the equine influenza A H3N8 virus. Scientists believe this virus jumped species (from horses to dogs) and has adapted to cause illness in dogs and spread among dogs, especially those housed in kennels and shelters. This is now considered a dog-specific, or canine, H3N8 virus. In September 2005, this virus was identified by experts as a “newly emerging pathogen in the dog population” in the United States.
The H3N2 canine influenza virus is an avian flu virus that adapted to infect dogs. Although H3N2 viruses have been reported to infect cats, dog flu is a disease of dogs. This virus is different from human seasonal H3N2 viruses. Canine influenza A H3N2 virus was first detected in dogs in South Korea in 2007and has since been reported in China and Thailand. H3N2 canine influenza has reportedly infected some cats as well as dogs. It was first detected in the United States in April 2015. It is not known how canine H3N2 virus was introduced into the United States.
What are signs of canine influenza infection in dogs?
The signs of this illness in dogs are cough, runny nose, fever, lethargy, eye discharge, and reduced appetite, but not all dogs will show signs of illness. The severity of illness associated with canine flu in dogs can range from no signs to severe illness resulting in pneumonia and sometimes death.
Most dogs recover within 2 to 3 weeks. However, some dogs may develop secondary bacterial infections which may lead to more severe illness and pneumonia. Anyone with concerns about their pet’s health, or whose pet is showing signs of canine influenza, should contact their veterinarian.
How serious is canine influenza infection in dogs?
The percentage of dogs infected with this disease that die is very small. Some dogs have asymptomatic infections (no signs of illness), while some have severe infections. Severe illness is characterized by the onset of pneumonia.
How is canine influenza spread?
Almost all dogs are susceptible to canine flu infection, and illness tends to spread among dogs housed in kennels and shelters. Canine flu can spread to other dogs by aerosolized respiratory secretions (coughing and sneezing) from infected dogs, by uninfected dogs coming into contact with contaminated objects, and by moving contaminated objects or materials between infected and uninfected dogs. Therefore, dog owners whose dogs are coughing or showing other signs of respiratory disease should not expose their dog to other dogs. Clothing, equipment, surfaces, and hands should be cleaned and disinfected after exposure to dogs showing signs of respiratory disease.
Is there a test for canine influenza?
Testing to confirm H3N8 and H3N2 canine influenza virus infection in dogs is available. Your veterinarian can tell you if testing is appropriate.
How is canine influenza infection in dogs treated?
Treatment largely consists of supportive care. This helps the dog mount an immune response. In the milder form of the disease, this care may include medication to make your dog more comfortable and fluids to ensure that your dog remains well-hydrated. Broad spectrum antibiotics may be prescribed by your veterinarian if a secondary bacterial infection is suspected.
Is there a vaccine for canine influenza?
Vaccines are available in the United States for both the H3N8 and H3N2 strains of canine influenza. Your veterinarian can provide you with additional information about the vaccines and whether you should consider vaccinating your dog.
My dog has a cough. What should I do?
Schedule an appointment with your veterinarian so they can evaluate your dog and recommend an appropriate course of treatment.
Where can I find more information on canine influenza virus?
More information on canine influenza in pet dogs can be found in this article: Influenza A Virus (H3N8) in Dogs with Respiratory Disease, Florida in Emerging Infectious Diseases journal, the AVMA website, and this update on the April 2015 Chicago H3N2 canine influenza outbreak.
References
Media Briefing on Canine Influenza. September 25, 2005. https://www.cdc.gov/media/transcripts/t050926.htm.
Update on Canine Influenza (Dog Flu) Outbreak Reported in Chicago Area. April 13, 2015. https://www.cdc.gov/flu/news/canine-influenza-update.htm.
Influenza A Virus (H3N8) in Dogs with Respiratory Disease, Florida. Volume 14, Number 6 – June 2008. http://wwwnc.cdc.gov/eid/article/14/6/07-1270_article.
Canine influenza. https://www.avma.org/KB/Resources/Reference/Pages/Canine-Influenza-Backgrounder.aspxType your paragraph here.
Are you concerned about Canine Influenza? You should be. There is some concern lately about the Canine Influenza "Dog Flu" virus currently spreading around the country. I have attached a link to help our customers understand just exactly what the Dog Flu is, how it's contracted and how to prevent and treat your dog. At Canine Design we take great measures to ensure that kennels are thoroughly cleaned and disinfected after each dog, and dogs that are not housed together at home are not kenneled together in the shop. We have increased the numbers of disinfectant moping of the floors, washing and drying rooms.
We highly recommend that you get your dogs immunized and that you keep up on all other immunizations before taking your dog out in public to any place where other dogs are present or have been, i.e. local stores where dogs are welcome, dog parks, and even walks where your dogs may come into contact with other dogs urine or fecal substances.