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Mysterious and fatal dog respiratory illness now reported in 14 states: See the map. – USA TODAY

An unknown and potentially deadly contagious canine respiratory illness that began in one Western state this summer now spans more than a dozen states, the nation’s lead non-profit veterinary organization is reporting.
As of Monday the disease had been reported in 14 states stretching from Florida to California and the cause of the mysterious illness remained under investigation, American Veterinary Medical Association (AVMA) President Dr. Rena Carlson, told USA TODAY.
In Oregon alone, veterinarians and animal sanctuary owners have reported more than 200 cases since mid-August. The remaining 13 states have not yet reported their respective numbers.
Oregon Department of Agriculture officials are working with state and national diagnostic laboratories “to identify the causative pathogen,” asking veterinarians to report cases to the department as soon as possible, AVMA reported, and advising pet owners to work with a vet if their dog is ill.
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In another affected state, the association reported, Colorado State University College of Veterinary Medicine and Biological Sciences reported, “The possible virus, which is under intense observation by Colorado State University veterinarians, has been linked to cases of severe pneumonia and, tragically, resulted in some fatalities.”
The exact fatality number nationwide was not immediately known, AVMA spokesperson Mark Rosati told USA TODAY Monday.
Here is where the disease has been reported as well as information about symptoms, treatment and tips for dog owners as the mysterious respiratory illness lingers:
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As of Monday the illness had been reported in the following states:
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According to the AVMA, common symptoms of the respiratory illness in dogs include:
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Although the exact transmission of the disease remains unknown, University of New Hampshire’s Veterinary Diagnostic Laboratory senior veterinary pathologist David Needle said he believes the illness, which causes chronic respiratory problems, is likely spread through close contact and breathing in the same air as an infected animal.
Needle, who told USA TODAY he has been studying the illness for more than a year at the school’s Hubbard Center for Genome Research, said the disease is not always fatal and so far, the dogs who contracted it and died had underlying issues.
Needle said he and a team from the university have been studying samples from Oregon, New Hampshire, Massachusetts and Rhode Island and are slated to begin receiving samples from Colorado and Illinois this week.
According to the University of Illinois School of Veterinary Medicine, outbreaks of canine infectious respiratory disease complex − also called kennel cough − often occur in shelters, boarding or training facilities over animals living in homes.
Unlike more common infections associated with kennel cough, that university reported, new cases do not respond to “standard medical therapy and can have a prolonged illness that can progress to pneumonia.”
Currently the treatment that dogs receive is symptomatic and supportive, Dr. Marta Vidal-Abarca, with Petkeen.com told USA TODAY.
“This means that, since the agent causing the infection has not been identified, the treatment is not aimed at killing any pathogen in particular,” Vidal-Abarca said Monday. “Instead, the treatment is aimed at mitigating clinical signs and facilitating the dog’s recovery.”
Treatment, Vidal-Abarca said, includes:
Although researchers are not yet sure what causes the illness, below are tips from the AVMA and Vidal-Abarca as well as other vets, to help avoid your dog from becoming infected with it.
Until the cause is determined, Michael Stepien, a spokesperson with the United States Department of Agriculture, said the federal agency will “continue supporting states with testing when needed,” but noted the agency’s support role is limited to testing and collaborating with partners.
Contributing: Saman Shafiq
Natalie Neysa Alund is a senior reporter for USA TODAY. Reach her at nalund@usatoday.com and follow her on X @nataliealund.


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