Featured Research

from universities, journals, and other organizations

Canine Influenza Was Around Earlier Than Once Thought

Date:
March 20, 2008
Source:
American Society for Microbiology
Summary:
The canine influenza virus, first identified in 2004, had been circulating in the greyhound population for at least five years prior to its discovery and may have been responsible for numerous outbreaks of respiratory disease among dogs at racing tracks during that period, according to new research.

The canine influenza virus, first identified in 2004, had been circulating in the greyhound population for at least five years prior to its discovery and may have been responsible for numerous outbreaks of respiratory disease among dogs at racing tracks during that period.
Credit: iStockphoto/Nico Smit

The canine influenza virus, first identified in 2004, had been circulating in the greyhound population for at least five years prior to its discovery and may have been responsible for numerous outbreaks of respiratory disease among dogs at racing tracks during that period, according to research presented March 18 at the 2008 International Conference on Emerging Infectious Diseases in Atlanta, Georgia.

Related Articles


"We have demonstrated the virus was in the greyhound population as early as 1999 and we speculate it was likely introduced sometime before that," says Tara Anderson of the University of Florida College of Veterinary Medicine, a lead researcher on the study.

Canine influenza is a highly contagious respiratory infection of dogs that is caused by the H3N8 influenza virus. The canine influenza virus is closely related to the virus that causes equine influenza and it is thought that the equine influenza virus mutated to produce the canine influenza virus. Two clinical syndromes have been seen in dogs infected with the canine influenza virus--a milder form associated with infection of the upper respiratory tract and a more severe form that is accompanied by pneumonia.

Because the virus is a novel pathogen, virtually all dogs that are exposed to the virus become infected and nearly 80% show clinical signs but most affected dogs have the mild form. Fatal cases of pneumonia resulting from infection with canine influenza virus have been reported in dogs, but the fatality rate (5% to 8%) has been low so far.

The first recognized outbreak of canine influenza in the world was believed to have occurred in racing greyhounds in January 2004 at a track in Florida. From June to August of 2004, outbreaks of respiratory disease were reported at 14 tracks in 6 states (Alabama, Arkansas, Florida, Kansas, Texas, and West Virginia). Between January and May of 2005, outbreaks occurred at 20 tracks in 11 states (Arizona, Arkansas, Colorado, Florida, Iowa, Kansas, Massachusetts, Rhode Island, Texas, West Virginia, and Wisconsin).

In June 2006, more outbreaks occurred at 3 tracks in Florida. Infection has also been confirmed in pet dogs in 25 states and Washington, DC. These cases occurred in animal shelters, humane societies, rescue groups, pet stores, boarding kennels, and veterinary clinics.

Anderson and her colleagues were concerned that a number of respiratory outbreaks of unknown cause at greyhound tracks prior to 2004 might be an indication that the virus had been in the dog population earlier. They were able to acquire greyhound blood samples for the period 1999 to 2004 from Hemopetฎ, an animal blood bank in California that uses retired greyhounds as donors. They tested these samples for antibodies to both the canine influenza virus and the equine influenza virus.

"For most dogs we had 2 to 3 years' worth of samples, so we were able to follow up with the same dog from year to year to see if it maintained antibody levels," says Anderson.

In 1999, 33% of the samples tested positive for antibodies to both canine and equine influenza viruses. Antibodies were also detected in samples collected in 2000 (38%), 2001 (19%), 2003 (44%) and 2004 (28%). Tracking the dogs using their ear tattoos, the researchers were able to determine that seropositive greyhounds were present at tracks or farms in a number of states during respiratory disease outbreaks in 1998, 1999 and 2003.

Only 1% of the 2002 samples tested positive. Interestingly, says Anderson, there were no outbreaks that year, and most of the sampled dogs had not been on tracks during the outbreaks in 1998 or 1999.

"Based on the serological evidence, we conclude that influenza A H3N8 virus was circulating in the racing greyhound population as early as 1999. The seropositive dogs were located at tracks involved in respiratory disease outbreaks of unknown etiology, suggesting that influenza A H3N8 virus may have been the causative agent of those outbreaks," says Anderson.


Story Source:

The above story is based on materials provided by American Society for Microbiology. Note: Materials may be edited for content and length.


Cite This Page:

American Society for Microbiology. "Canine Influenza Was Around Earlier Than Once Thought." ScienceDaily. ScienceDaily, 20 March 2008. <www.sciencedaily.com/releases/2008/03/080318124104.htm>.
American Society for Microbiology. (2008, March 20). Canine Influenza Was Around Earlier Than Once Thought. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2008/03/080318124104.htm
American Society for Microbiology. "Canine Influenza Was Around Earlier Than Once Thought." ScienceDaily. www.sciencedaily.com/releases/2008/03/080318124104.htm (accessed October 24, 2014).

Share This



More Plants & Animals News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Reuters - Innovations Video Online (Oct. 24, 2014) — Miniature deep sea animals discovered off the Australian coast almost three decades ago are puzzling scientists, who say the organisms have proved impossible to categorise. Academics at the Natural History of Denmark have appealed to the world scientific community for help, saying that further information on Dendrogramma enigmatica and Dendrogramma discoides could answer key evolutionary questions. Jim Drury has more. Video provided by Reuters
Powered by NewsLook.com
Black Bear Cub Goes Sunday Shopping

Black Bear Cub Goes Sunday Shopping

Reuters - Light News Video Online (Oct. 23, 2014) — Price check on honey? Bear cub startles Oregon drugstore shoppers. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Dances With Wolves in China's Wild West

Dances With Wolves in China's Wild West

AFP (Oct. 23, 2014) — One man is on a mission to boost the population of wolves in China's violence-wracked far west. The animal - symbol of the Uighur minority there - is under threat with a massive human resettlement program in the region. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
Breakfast Debate: To Eat Or Not To Eat?

Breakfast Debate: To Eat Or Not To Eat?

Newsy (Oct. 23, 2014) — Conflicting studies published in the same week re-ignited the debate over whether we should be eating breakfast. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins