How do dogs or cats become infected with West Nile virus?
A. The same way humans become infected, by the bite of infectious mosquitoes. The virus is located in the mosquito’s salivary glands. During blood feeding, the virus is injected into the animal. The virus then multiplies and may cause illness. Mosquitoes become infected when they feed on infected birds, which may circulate the virus in their blood for a few days. It is possible that dogs and cats could become infected by eating dead infected animals such as birds, but this is unproven.
Dogs and cats become infected the same way humans become infected: by the bite of an infected mosquito. Q: Can a dog or cat infected with West Nile virus infect other dogs or cats? A: No. There is no documented evidence that West Nile virus is transmitted between dogs and cats. Q: How long can a dog or cat be infected with West Nile virus? A: The answer is not known at this time. Q: What should I do if I think my dog, cat, or other pet might have West Nile virus? A: While dogs and cats do not appear to suffer clinical illness from West Nile virus, if you think your pet is ill you should see your veterinarian promptly. Pets can develop neurologic diseases from many other causes, and these should be ruled out before testing for West Nile virus is considered. Veterinarians should contact the New York City or New York State Departments of Health to arrange for testing of pets suspected of having West Nile virus infection. Q: Should a dog or cat infected with West Nile virus be euthanized?
