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Should you worry about giving the flu to your dog or cat?

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As autumn arrives, the approach of flu season is a real concern. Last year, thousands of people suffered from symptoms including a high fever, chills and fatigue—classic signs of the flu. Some 2,374 people in the United States were hospitalized for influenza during the last flu season — an incentive for many of us to get an annual flu vaccine, to avoid both getting sick and potentially passing on the flu to family members.

A group of veterinarians at Oregon State and Iowa State Universities is now looking into the risk of flu for an unexpected population that doesn’t have access to flu shots: dogs, cats and other household pets. “We worry a lot about zoonoses, the transmission of diseases from animals to people,” said Christiane Loehr, a professor at the OSU College of Veterinary Medicine. “But most people don’t realize that humans can also pass diseases to animals, and this raises questions and concerns about mutations, new viral forms and evolving diseases that may potentially be zoonotic. And, of course, there is concern about the health of the animals.”

We’re pretty well acquainted with zoonoses—diseases that can move from animals to humans—because of the high profile transmissions of the influenza strains H1N1 (“swine flu“) and H5N1 (“bird flu”) from animals in recent years. But, as it turns out, many diseases can also act as so-called reverse zoonoses, or anthroponoses, contagiously jumping from humans to other animals. This appears to be the case for H1N1: The researchers have discovered 13 cases in which H1N1 seems to have been passed from humans to pet cats, some of which ultimately died from the disease.

The first recorded instance, described in an article published by the team in Veterinary Pathology, took place in Oregon in 2009. While a cat owner was hospitalized with H1N1, both of her cats (which stayed indoors and had no contact with other sick people or animals) came down with flu-like symptoms and eventually died. A postmortem analysis of their lungs and nasal cavities turned up the H1N1 virus.

In the years since, the research team has turned up 11 more cats, one dog and even some ferrets that seem to have been infected with H1N1 due to human contact. The animals’ flu symptoms—respiratory disease and, for some, eventual death—resemble the same symptoms suffered by humans who encounter severe strains of the flu…

Realistically, though, the actual number of animals infected is quite small when compared to the population at large. The bigger worry is that the flu virus could mutate into a more dangerous form as it is transmitted from humans to animals. “Any time you have infection of a virus into a new species, it’s a concern, a black box of uncertainty,” Loehr noted.

If your companion animal is close to you, emotionally as well as physically, you would be irresponsible to ignore the possibility, albeit small. Even if your cat or dog doesn’t care – for example – about sneezing on you, you needn’t be so thoughtless. The thought doesn’t occur to them. It certainly should pop up in your own brain box. :)

So – if you’re struggling your way through the flu – wash your hands before you pet and hug your companion critter. As you would or should with your other kids.

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Written by Ed Campbell

October 7, 2012 at 10:00 am

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