Monday, August 20, 2018

PRO/AH/EDR> West Nile virus (19): Americas (USA) mosquitoes, birds

WEST NILE VIRUS (19): AMERICAS (USA) MOSQUITOES, BIRDS
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A ProMED-mail post
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International Society for Infectious Diseases
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Date: Sat 18 Aug 2018 7:47 PM PDT
Source: East Bay Times [edited]
<https://www.eastbaytimes.com/2018/08/18/yearly-total-of-west-nile-virus-cases-in-contra-costa-jump-by-50-percent-in-one-week/>


The _Culex pipiens_ mosquito is the insect primarily responsible for
the spread of West Nile virus in the Bay Area [California]. The number
of birds and mosquitoes testing positive for the West Nile virus has
increased by 50 percent in the past week, the county Mosquito & Vector
Control District reported on [Fri 17 Aug 2018].

In the past week, there have been 4 groups of mosquitoes, 4 dead
birds, and one group of sentinel chickens that have tested positive
for the West Nile virus. The discoveries have doubled the number of
dead birds found with the virus in Contra Costa County for this year
[2018] and nearly doubled the number of positive mosquito groups.

Usually, the months of August and September, when baby birds are
leaving their nests and mosquitoes bite more often, are when the virus
peaks, the district warned.

"As we enter the peak of West Nile virus season we're starting to see
more widespread activity," said Steve Schutz, the district's
scientific programs manager. "People in all areas of Contra Costa
county should be protecting themselves against mosquito bites."

There have been 10 groups of mosquitoes, 8 dead birds and 13 chickens
from Contra Costa county that have tested positive for the virus this
year [2018].

There have been no reported cases of West Nile virus appearing in
humans or horses in Contra Costa county this year [2018], but there
were 4 cases in 2017. In total, there was one horse, 19 dead birds, 9
mosquito groups, and 7 chickens found with the virus in 2017.

Mosquitoes testing positive for the virus this year [2018] have been
from Oakley, Martinez, Holland Tract, Discovery Bay and Quimby Island.
Birds found with the virus have been from Brentwood, Discovery Bay,
Antioch and Concord. Chickens from Holland Tract have also tested
positive. This was the 1st West Nile virus activity for the yea in
Antioch, Quimby Island, and Concord [all in Costa county].

San Joaquin County has seen 4 cases of the virus in humans this year
[2018].

West Nile, a virus reported in all US. states, is spread to people by
mosquito bites. Most people infected do not detect symptoms, according
to the Centers for Disease Control and Prevention. One in 5 develop a
fever or other symptoms and one out of 150 have a serious or sometimes
deadly illness, the CDC says. There is no vaccines to prevent it [in
humans, but there is for equine animals. - Mod.TY]. Dead birds --
often ravens, jays, crows, and magpies -- are often the 1st sign of
the disease.

Mosquito & Vector Control District of Contra Costa said people should
use mosquito repellents, drain pools or other standing water that
mosquitoes breed in and report any dead birds to 1-877-968-2473
(1-877-WNV-BIRD).

--
Communicated by:
ProMED-mail from HealthMap Alerts
<promed@promedmail.org>

[Transmission of West Nile virus appears to be accelerating in Contra
Costa county. There have been 13 reported human cases in California so
far in 2018, 7 of which were neuroinvasive (see West Nile virus (16):
Americas (USA) http://promedmail.org/post/20180818.5973103). The
advice to avoid mosquito bites is sound and should be heeded, as is
elimination of mosquito breeding sites. It seems odd that no mention
is made of recommendations for vaccination of equine animals, given
detection of the virus in mosquitoes in the area. - Mod.TY

HealthMap/ProMED-mail map of California, United States:
http://healthmap.org/promed/p/4569>
California county map:
<https://www.mapofus.org/wp-content/uploads/2013/09/CA-county.jpg>]

[See Also:
West Nile virus (16): Americas (USA)
http://promedmail.org/post/20180818.5973103
West Nile virus (14): Americas (USA) equine, human
http://promedmail.org/post/20180811.5957920
West Nile virus (08): Americas (USA) equine, human
http://promedmail.org/post/20180811.5957920
West Nile virus (07): Americas (USA)
http://promedmail.org/post/20180701.5883730
and other items in the archives]
.................................................sb/ml/ty/mj/lxl
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