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H3N8 virus, H3N2 virus
From Baker Institute for Animal Heath, at Cornell:
Canine influenza is a viral disease that causes symptoms similar to those experienced by humans with flu,including cough, sneezing, lethargy, fever, and discharge from the nose and eyes.
There are two known influenza viruses that can infect dogs in the United States.
Is there a vaccine for canine influenza?
There is vaccine available in the US for H3N8 influenza, but not for H3N2.
Although both strains of canine influenza are H3 viruses and share some traits incommon, the antigens of H3N2 are different from the H3N8 virus strain, so the H3N8 vaccine may not provide protection against the H3N2 virus.
H3N8
The virus known as H3N8 canine influenza hasexisted in North America since 2000, whena strain of influenza in horses spread to dogs. Today, the H3N8 virus is mostly found among dogs living in animal shelters but is more widespread during outbreaks.
H3N2
H3N2 was found in the US in 2015. First found in Asia in 2005 or 2006, H3N2 is derived from an avian virus that gained the ability to infect dogs. H3N2 has been found in household dogs, dogs in shelters, and in breeding facilities.
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