2001-Mon Feb 20 15:29:46 MST 2017
Vetstreet. All rights reserved.
Vetstreet does not provide medical advice, diagnosis, or treatment. See Additional Information ›
As summer begins, news programs are rife with stories about the Zika and West Nile viruses.
Infectious disease specialists warn about the potential for disease in people. But what about your pets — are they at risk, too?
Once limited to Africa, Europe, India, the Middle East, Asia and Australia, West Nile virus (WNV) crossed the ocean to North America in 1999 and has since advanced across the United States and Canada. Most commonly spread by infected mosquitoes, the virus usually infects people and horses.
Infected people and horses may have a fever or show no signs at all. With severe infections, they
may display signs associated with encephalitis (inflammation of the brain) or meningitis (inflammation of the lining of the brain and spinal cord), such as disorientation, seizures or paralysis.
Typically, people and horses infected with WNV have very low levels of the virus circulating in their blood, so the virus usually isn’t transmitted to mosquitoes during feeding. That means an otherwise uninfected mosquito generally can’t spread the virus from one horse to another, from a horse to a human or vice versa. To spread the virus, a mosquito must first feed on
birds, or in some cases rodents, which typically carry higher levels of circulating virus.
Little information is available regarding the susceptibility of dogs and cats to WNV infection. It appears that dogs and
cats may be exposed to the virus through a mosquito bite or through ingestion of infected small mammals or wild
birds. However, the virus does not appear to cause overt disease in our small companion animals.
In a study of dogs experimentally infected with the West Nile virus, none of the
dogs showed clinical signs of disease. The dogs did have measurable amounts of virus in their blood, but the quantity was so low, it was unlikely to result in transmission of the virus to feeding mosquitoes.
Cats experimentally infected with WNV showed mild, nonspecific signs of disease, including
lethargy, decreased appetite and fever. Compared with
dogs in the study, cats had a higher virus concentration in their blood, which may be enough to infect mosquitoes but not as effectively as infected birds could.
These studies indicate that although dogs and
cats can become infected by the WNV, they may not show obvious signs, and neither species is likely to be a source of infection for people.
Like this article? Have a point of view to share? Let us know!
Take our breed quiz to find your next pet.
Get all the best pet news and information sent right to your inbox!
Thank you for subscribing!
Many dogs will eat just about anything in
their path. That's why it's so important to
know the signs of intestinal…
From taking pills to clipping nails,
we’re here to help you take the stress
out of things many dogs loathe.
With plenty of patience, practice and
praise your dog might be willing to accept
— or even enjoy — this dental care…
Need a leash for regular outings or one
that can walk multiple canines? These
types of leashes are your best…
The fun and rambunctious Flat-Coated Retriever, known for his puppyish enthusiasm, makes a great family pet.
Check out our collection of more than 250 videos about pet training, animal behavior, dog and cat breeds and more.
Wonder which dog or cat best fits your lifestyle? Our new tool will narrow down more than 300 breeds for you.
If the video doesn't start playing momentarily,
please install the latest version of Flash.
Thank you for subscribing.