By Dan Simon
If you're concerned about the risks of catching mosquito-borne
illnesses, such as West Nile Virus, there are precautions you can
take to protect both yourself and your pets.
The first thing to do is minimize your potential contact with mosquitoes.
You can start with an appropriate insect repellant for both yourself
and your pet. Make sure you check with your veterinarian to make
sure the repellent you're using is also safe for your pet (not all
human insect repellents are safe for dogs and cats).
Whatever insect repellent you choose, the Centers for Disease Control
and Prevention recommend it contain DEET, which the agency describes
as "the most effective and best-studied insect repellent available."
DEET is an insect repellent ingredient, not a brand. The higher
the concentration of DEET, the longer lasting the repellant effectiveness
will be although concentrations higher than 50 percent haven't been
proven to provide protection any longer than 50 percent strength
applications.
The CDC also recommends staying inside during peak mosquito biting
times, which include dawn, dusk and early evenings. Also check windows,
doors and screens to be sure there's no potential mosquito entry
points.
Getting rid of any standing water on your property is also high
on the list of mosquito prevention measures. Even a tiny amount
of water can serve as a breeding ground for these insects. If you
want to keep a small pond filled, add some mosquito dunks that contain
a naturally-occurring bacteria that stops mosquito larvae from developing.
These "BT" (which stands for "Bacillus thuringiensis")
are a naturally occurring soil bacteria that's proved effective
against certain gardening pests. A version known as "Bt Israelensis,"
is the strain used for these dunks. This product, usually called
"mosquito dunks" is available at many garden supply or
lawn and garden shops and each one lasts for about a month.
When it comes to your pets and a disease such as the West Nile Virus,
there's no set answer that works for every type of animal. One thing
does appear to be consistent though. The disease can only be transmitted
via a mosquito bite and not from pet to human or pet to pet.

While family pets can also be infected with West Nile Virus,
most cats and dogs will suffer few effects from the disease.
Just like with humans though, older pets face a greater risk
from the disease. ©Photo by Dan Simon for GreenWorks.
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The best current evidence suggests that dogs and cats may be able
to become infected with the virus, but are at low risk of dying
from it. Dogs and cats that do become infected can recover from
it with normal supportive care. Just as in humans, an older or infirm
pet will be more at risk from the disease than one in the prime
of life.
The virus is more of a threat for horses, with some fatalities from
the disease occurring in the United States. An experimental vaccine
has been developed to offer horses some protection from the virus.
Just as with humans and other pets, the best protection seems to
be taking measures to avoid mosquito bites.
Remember that West Nile Virus is only one disease that can be carried
by mosquitoes. The disease is also far less dangerous to humans
than other mosquito-borne diseases, such as malaria or St. Louis
Encephalitis. Most people who become infected suffer flu-like symptoms
for a few days, recover and enjoy future immunity from the disease
(although this may diminish over the years) according to a CDC web
site on the disease. People over 50 years of age are the most
likely to develop severe illnesses from the disease.
"Even if the mosquito is infected, less than one percent of
people who get bitten and become infected will get severely ill.
The chances you will become severely ill from any one mosquito bite
are extremely small," according to information on the disease
at the CDC.
A trial is currently underway to test the effectiveness of alpha-interferon
in treating the West Nile Virus in infected humans. There is some
optimism this drug may be effective against the disease because
it's helped lessen the symptoms of St. Louis Encephalitis, a similar
disease. There is also work in progress on a human vaccine for the
disease, with the possibility of its availability as early as next
year.
In the meantime, the easiest, and most pleasant, approach is to
just avoid getting bit. While the risk of catching a mosquito-borne
disease is pretty low, those bites still itch!
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