COTATI, Calif. (KRON) – A group of mosquitoes tested positive for West Nile virus, according to the Marin/Sonoma Mosquito and Vector Control District.
The district said on Monday that the adult mosquitoes were collected in traps in Sonoma County — This is the second sample group this year to test positive in the county.
This group was in the area of Santa Rosa Avenue and Burt Street in Santa Rosa, officials said.
Staff continues to search the area for new sources of mosquito production.
“District staff will continue to monitor the distribution and abundance of adult mosquitoes in the area where the positive mosquito sample was collected,” stated Nizza Sequeira, Public Information Officer. “The District will also continue to test viable adult mosquito samples collected in the area for WNV. In the meantime, we ask that residents report mosquito problems to our office and take personal protection measures such as wearing an effective mosquito repellent when engaging in outdoor activities.”
County vector control personnel informed Graham Jenkins and his wife late last month that the itchy bites on their ankles were the work of an insidious mosquito that had invaded their Gardena home — and that there was nothing they could do.
“These little buggers are living with us forever now,” Jenkins said.
A pair of bites on the 34-year-old’s wrist recently got infected and sent him to the emergency room. After a week of antibiotics, he said he was “almost back to normal,” but still wearing his watch on the other wrist.
The invasive Aedes mosquito is an aggressive biter with the ability to pierce clothing and reproduce in water sources as small as a bottle cap. Flying low to the ground, they strike during the daytime, preferring human blood to that of birds or other animals. They often strike multiple times in rapid succession.
Los Angeles County authorities are warning residents that an invasive species of tropical mosquitoes is becoming more prevalent in the region.
The Aedes mosquitos are more aggressive against humans than other species in the area, and they’re difficult to get rid of because their ability to reproduce exponentially, experts say. They’ve also triggered a warning in the San Gabriel Valley and Orange County.
Vector control officials set up traps in neighborhoods around L.A. County to monitor the insects, and so far this year they’ve trapped the most in Sunland and Sun Valley.
People aren’t imagining it when they say they’re getting bit more this year, said Susanne Kluh, director of scientific and technical services for the Greater L.A. County Vector Control District.
The species has been in the region since 2011, but “depending on where you live, it might have just started really building up this year,” Kluh said.
Yellowjackets stings are painful but the district warns that those allergic could have adverse reactions to them.
“While this is not an unusual occurrence for fall, they do seem to be out in larger numbers this year especially compared to previous seasons,” Gary Goodman, District Manager for the Sacramento-Yolo Mosquito and Vector Control District, said in a news release.
Alameda County’s mosquito abatement district said Monday that a dead bird’s remains tested were positive for West Nile virus, the first positive test of the year.
The bird was collected in Pleasanton and underwent testing at a district laboratory. Officials said they plan to boost mosquito monitoring and larval control efforts near where the bird was found.
“With the change of season, residents may assume mosquitoes are no longer a threat, but this is usually the time of year when we see an increase in West Nile virus in our county,” district general manager Ryan Clausnitzer said.
“With light showers in the mornings followed by warm weather in the afternoons, mosquitoes still have plenty of opportunities to breed and flourish,” Clausnitzer said in part. “While we are not detecting high numbers of mosquitoes in the area where the bird was found, there is an increased risk of West Nile virus with every mosquito bite.”
CONTRA COSTA COUNTY, CA — A second bird in Contra Costa County and another group of mosquitoes tested positive for West Nile Virus, county vector control officials said Friday.
The bird was found in San Pablo and the mosquitoes were in a trap in Oakley. It’s the first dead bird this year in San Pablo to have West Nile Virus.
So far this year in the county, two dead birds have been found with West Nile Virus as well as eight groups of mosquitoes.
Vector control officials said certain birds carry West Nile Virus and mosquitoes can become infected when they bite an infected bird. Mosquitoes spread the virus by biting another bird or a person.
A mosquito sample collected in Stanislaus County has tested positive for St. Louis Encephalitis virus, according to the area’s two mosquito abatement districts.
Like West Nile Virus, most people who become infected with SLEV will never feel sick. Most people who do feel sick will have mild flu-like symptoms; a small number of people will have severe disease with headache, confusion, disorientation and dizziness. Seizures, paralysis, coma and sometimes death may occur. Severe disease is more likely in people who are older and those with weakened immune systems.
SLEV is related to the West Nile Virus and is transmitted via the bite of Culex mosquitoes, the same mosquitoes that transmit WNV.
“The discovery of positive mosquito pools is a reminder that we need to continuously prevent mosquito breeding in our community. There is no specific treatment for SLEV or WNV, so it is very important that people protect themselves and their families from mosquito bites,” advises Dr. Julie Vaishampayan, Stanislaus County Public Health Officer. “We ask everyone to use mosquito repellents to protect themselves and their loved ones from mosquito-borne viruses, especially when they are outdoors.”
When I moved to Los Angeles years ago, I was told by native Angeleno friends that the city without humidity also definitely did not have mosquitoes.
What is that whizzing sound then? The welts on my ankles? My favorite cafe has taken to selling bottles of insect repellent next to the cash register. Were my friends wrong, or should we acknowledge that this winged scourge is part of life in the Golden State?
Since 2011, scientists have tracked an invasive mosquito species in parts of California: the Aedes aegypti. These black-and-white-striped “ankle-biters,” which can transmit dengue fever, Zika virus and yellow fever, have been found up and down the state.
LAKE COUNTY, Calif. — The Lake County Vector Control District said West Nile virus has been detected in two more mosquito samples and also in sentinel chickens in Lake County.
The sentinel chickens were in a flock near Upper Lake. The mosquitoes, all Culex tarsalis — the western encephalitis mosquito — were collected in traps set in Lower Lake and Upper Lake, the district reported.
Earlier this summer positive mosquitoes were collected near Kelseyville and Upper Lake, the district said.
“When we see West Nile virus in sentinel chickens, that tells us that the conditions are right for human infections of West Nile virus,” said Jamesina Scott, Ph.D., district manager and research director of the Lake County Vector Control District. “The best protection from West Nile virus is prevention. It’s important to avoid mosquito bites.”
While many people might think mosquitoes are not a big deal in Southern California, where it’s not so humid, they should think again.
Public health officials say that the number of mosquito bites in the Los Angeles area has risen in recent years. And the hotter summers of the past few years may foreshadow conditions that boost the numbers of these small, blood-sucking pests.
That raises concerns about West Nile Virus, an incurable and potentially deadly mosquito-borne illness that can be transmitted to humans and animals.
Los Angeles County health officials have reported the county’s first death this year due to West Nile virus.
The patient, a resident of the eastern region of the county, was hospitalized and died from a neuro-invasive disease associated with the virus, officials announced Friday. No further information was given about the individual or the date of death.
County officials have documented a total of 10 cases in the county so far this year, excluding Long Beach and Pasadena, which have their own health departments. The state reported its first West Nile virus-related death in July in San Luis Obispo County.
The mosquito-borne virus is common in California in summer and early fall. Most people who become infected don’t experience symptoms, according to the Centers for Disease Control and Prevention, but some may experience fever, muscle aches and tiredness. In severe cases of infection, especially in people over 50 years old and those with chronic medical conditions such as cancer and diabetes, the virus can affect the brain and spinal cord, causing meningitis, encephalitis and paralysis.
We’re lucky to have the expertise and efficiency shown year round by the Placer Mosquito and Vector Control District.
Although we often see the district’s trucks and employees in our neighborhoods, the district does not receive much public recognition for its success in eradicating invasive mosquito species from spreading throughout the area.
And we don’t usually reflect on the Placer Mosquito and Vector Control District’s around-the-clock efforts to stop the 30 mosquito species from multiplying here.
But if we find a mosquito that might carry a disease or we find a dead bird on our property, district employees are the first ones we call, as we expect immediate assistance.
So we appreciate the organization’s 26 employees working daily during mosquito season to keep potentially deadly or debilitating mosquito-borne diseases such as West Nile virus, yellow fever or Zika mosquitoes at bay. West Nile virus mosquito season is usually from mid-June to September or October, subsiding once temperatures are below 60 degrees. We’re still in the midst of mosquito season.
The Santa Clara County Vector Control District, which monitors the transmission of vector-borne diseases from insects, will be treating parts of Palo Alto and Mountain View with insecticide after recently detecting West Nile virus-positive mosquitoes in limited areas of the two cities.
Weather permitting, the district will use trucks to spray the impacted areas on Friday, Sept. 17, starting around 10 p.m., according to a county press release. The process should take three hours.
The first human case of West Nile virus (WNV) during this mosquito season was reported at Long Beach this week. The patient is in his 40s and has been diagnosed with a neuroinvasive disease and is currently recovering at home.
“This is an important reminder to keep people from being bitten by mosquitoes,” said Dr. Anissa Davis, City Health Officer. “Everyone needs to take steps to prevent mosquito-borne diseases.”
There are 32 cases of WNV reported in California this year, and 5 in LA County. Long beach mosquitoes have not been known to be positive for WNV so far this season.
WNV is transmitted by being bitten by an infected Culex pipiens. Signs and symptoms of WNV include fever, body aches, rashes, nausea, vomiting, and headaches. Most infected people have no symptoms. One in 150 people can develop more serious illnesses such as inflammation and paralysis of the brain. People with these symptoms need immediate treatment.
A new invasive mosquito taking root in the Sacramento region during a busy year for West Nile virus has local vector officials on the lookout ahead of the Labor Day weekend.
The mosquito Aedes aegypti was spotted for the first time this week in Elk Grove and in Orangevale, said Sacramento-Yolo Mosquito and Vector Control District officials, joining known breeding grounds in the Arden Arcade area and in Winters in Yolo County. Vector district officials reported the first sightings of the invasive mosquitoes in 2019 in Citrus Heights.
The sightings come as West Nile virus activity has been, in officials’ words, “steady and widespread” in both Sacramento and Yolo counties.
CHICO — In Butte County, seven new pools of West Nile virus have been found while four sentinel chickens have tested positive for the virus. The West Nile virus has resulted in one death in Butte County so far this year.
Butte County Mosquito and Vector Control District said the virus is considered “widespread” among mosquitoes in the county with this year seeing 76 positive pools. The highest year on record was 2015 when 101 mosquito pools with active cases of West Nile virus were found.
“2015 was the fourth year of the drought,” said Butte County Mosquito and Vector Control District Manager Matt Ball. “One would think droughts mean less mosquitoes therefore there should be less virus. Well, here in Butte County, droughts actually mean propagation of the virus and it means more artificial water, flooding and irrigating sooner than natural weather. We actually see more mosquitoes and more virus on drought years than when we get a nice cool wet spring.”
Bird found in Simi Valley tests positive for West Nile virus
From the VC Star August 30, 2021
A bird collected in Simi Valley has become the first of 2021 to test positive for the West Nile virus in Ventura County, health officials said Monday.
The Ventura County Environmental Health Division said the bird was collected in the city during the third week of August. The California Department of Public Health recently confirmed the positive test result.
The San Gabriel Valley Mosquito and Vector Control District (SGVMVCD) will teach local residents about mosquito prevention techniques, including choosing the right repellent through an online webinar this week.
According to SGVMVCD communications director Levy Sun, the mosquito control district has decided to hold the “Bite Back Tour” webinar as the expected warmer weather in cities across the San Gabriel Valley, including Pasadena, may bring a rise in mosquito and West Nile Virus activity.
The SGVMVCD will make stops in cities across the San Gabriel Valley to show residents how they can best protect themselves from mosquitoes, according to Sun.
“This is the first year we conducted this tour in response to people wanting access to mosquito safety information in a virtual on-demand and live format,” said Sun.
Targeted treatment scheduled for Thursday, August 26 in limited area in Gilroy
SANTA CLARA COUNTY, CALIF. – The County of Santa Clara Vector Control District has confirmed West Nile virus (WNV) positive tests in adult mosquitoes collected from portions of the 95020 ZIP code area that includes part of Gilroy. As a result, a truck-mounted adult mosquito control treatment has been scheduled in the area to prevent human cases of WNV. Weather permitting, the ground operations are scheduled for approximately 10 p.m. on Thursday, August 26, and will conclude a few hours later. The District is adhering to all recommendations from the Centers for Diseases Control and the County of Santa Clara Public Health Department regarding the Coronavirus (COVID-19) and will be conducting the treatment in accordance with those guidelines.
Door hangers notifying the public of the scheduled mosquito treatment will be placed in neighborhoods beginning Tuesday, August 24. Notice is also being sent directly to the public in the treatment ZIP codes through AlertSCC, and to those who subscribe to Nextdoor neighborhood networks. General notice also is being provided on various social media platforms, including Mailchimp email notification, Facebook, Instagram, and Twitter (@SCCVCD).
Merced County Department of Public Health officials notified Merced County Mosquito Abatement District (District) that a male in his 60s contracted West Nile Virus (WNV) fever in the City of Merced. This is the first human case of WNV in the County this year. In addition to the human case, the District has detected WNV in one (1) sentinel chicken, one (1) mosquito pooled sample, and one (1) dead bird to date in Merced County. As of Aug. 6, 2021, eight (8) human cases have been confirmed in California.
West Nile Virus is transmitted through the bite of an infected mosquito. County residents are encouraged to continue their efforts to reduce mosquito breeding and WNV prevention by taking the following steps:
Eliminate sources of standing water where mosquitoes lay their eggs.
Avoid spending time outside when mosquitoes are most active (dawn and dusk).
Apply insect repellent containing the active ingredient DEET when outdoors, according to label instructions. In addition to DEET-based products, the Centers for Disease Control (CDC) also recommends insect repellant containing oil of lemon eucalyptus and Picaridin.
TULARE COUNTY, Calif. (KSEE/KGPE) — Residents who live in part of California’s Central Valley say they are hoping a slight increase in their property taxes will mean getting a break from an invasive species of mosquito.
According to the Delta Mosquito Vector Control District, “Aedes aegypti” is an invasive species of mosquito that have made its way into many counties in California. They are aggressive, day-biters found both indoors and outdoors, and they especially like to feed on ankles, wrists, and elbows.
The Aedes aegypti, also called the “ankle biter,” were detected in the Yuba City area Wednesday, according to a news release from the Sutter-Yuba Mosquito and Vector Control District (SYMVCD).
The release said the mosquitoes, if spotted, will look unfamiliar to most people. A quarter-inch long, these black-and-white-striped mosquitoes are stealthy and aggressive biters during the day, and they lay eggs that look like small black seeds. Diseases control experts say the mosquitoes carry diseases such as dengue, chikungunya, Zika and yellow fever.
Stanislaus County Public Health has confirmed the first human West Nile virus (WNV) infection in the county. An adult female was diagnosed with West Nile fever (non-neuroinvasive disease). The first pools of mosquitoes in the county tested positive for West Nile virus on June 11, 2021.
West Nile virus spreads to people and animals through the bite of a mosquito infected with the virus. Hot weather, abandoned swimming pools, and standing water create ideal conditions for the development of mosquitoes and the subsequent spread of the virus. About one in five people will develop West Nile fever with symptoms of headache, fever, and fatigue. However, some people (less than one percent) will develop serious neurologic illness, such as encephalitis or meningitis.
People 50 years of age and older have a higher chance of getting sick and are more likely to develop serious illness when infected with WNV. Studies also indicate that those with diabetes and/or hypertension are at greatest risk for serious illness. There is no specific treatment for WNV disease.
Health officials in Ventura County have detected an invasive mosquito capable of transmitting several viruses, like yellow fever and Zika.
There is no confirmed transmission of the diseases in our state but experts say you still want to avoid being bitten.
Since September of last year, Aedes aegypti mosquitoes have been found in several communities including Simi Valley, Thousand Oaks, Oak View, Oxnard, and now Ojai.
Health officials warn the public to take steps to avoid mosquito bites and to avoid providing breeding places for mosquitoes in standing water, such as bird baths and fountains and other outdoor locations where water may pool and become stagnant.
Mosquitoes infected with West Nile virus were discovered in La Quinta, officials announced Thursday.
The infected mosquitoes were collected from traps near Avenue 52 and Jefferson Street, according to the Coachella Valley Mosquito and Vector Control District.
“It’s not worth the risk. It only takes one bite from an infected mosquito to make you sick.” said Tammy Gordon, a district spokeswoman. “Know your risk and wear insect repellent to reduce the risk of getting sick.”
So far this year, district technicians have collected mosquitoes infected with WNV from nine traps, mostly on the northern edge of the Salton Sea in the communities of Mecca and North Shore.
LAKEPORT, Calif. — For the first time this year, mosquitoes have tested positive for West Nile virus in Lake County.
The mosquitoes, Culex tarsalis (western encephalitis mosquito), were collected in traps near Upper Lake on July 21, the Lake County Vector Control District reported.
“West Nile virus activity is increasing statewide, including in Lake County,” said Jamesina Scott, Ph.D., district manager and research director of the Lake County Vector Control District. “This serves as a reminder to avoid mosquito bites to avoid West Nile virus.”
Scott said mosquitoes thrive in still water. Dump out or drain water in backyard water sources, or contact the district for free mosquito-eating fish for water that can’t be drained, like unmaintained (green) swimming pools and spas, ornamental ponds, or animal watering troughs, she advised residents.
Stanislaus County announced its first human case of West Nile virus this year, a woman with a moderate form of the disease.
The age and hometown of the woman were not disclosed in Tuesday’s news release from county Public Health. It urged residents to guard against the mosquitoes that carry the virus.
California had four other symptomatic infections this year as of July 30, according to the weekly update from the state Department of Public Health. They include a person who died in San Luis Obispo County and nonfatal cases in Shasta, Fresno and Kern counties.
Mosquitoes in Needles Also Tested Positive
San Bernardino County Public Health officials are urging residents to take precautions after a bird carcass collected in Lake Arrowhead and a collection of mosquitoes from Needles tested positive for West Nile virus.
The Steller’s jay, collected on July 5, is the first positive case of 2021 within the area served by the County Environmental Health Services Mosquito and Vector Control Program (MVCP). In the same week, a collection of mosquitoes tested positive for West Nile virus in the city of Needles. MVCP is taking steps to eliminate mosquito breeding hazards.
People bitten by an infected mosquito may develop West Nile fever and experience flu-like symptoms which may include fever, body aches, skin rash, and fatigue. In some people, West Nile fever can develop into a more serious form of the disease. If you have been bitten by mosquitoes and are experiencing these symptoms, contact your medical care provider as soon as possible.
A local mosquito control official is urging the public to protect themselves from mosquito bites and intensify their mosquito prevention measures at home after West Nile virus was detected for the first time in Pasadena in 2021.
Levy Sun, communications director of the San Gabriel Valley Mosquito and Vector Control District (SGVMVCD), on Monday confirmed the detection of the virus in mosquito samples collected from traps set in Eaton Blanche Park in Pasadena.
Sun noted that this is the first time in three years that officials detected the West Nile virus in Pasadena.
The announcement comes a week after the Greater Los Angeles County Vector Control District (GLACVCD) announced the detection of the virus in its service area.
“We detected a West Nile virus in the community around Eaton Blanche Park,” Sun said.
Mosquito samples collected from mosquito traps in three Los Angeles County cities tested positive for the West Nile virus, officials confirmed Thursday.
The Greater Los Angeles County Vector Control District collected samples from mosquito traps in Bellflower (90706), Studio City (91602) and Tarzana (91356), confirming the presence of the virus in mosquito populations within the community.
While this confirmation serves as the District’s first positive West Nile virus mosquito pool this year, virus activity has been increasing steadily throughout California, including other vector control jurisdictions within the County.
LANCASTER — An invasive mosquito species known to spread tropical diseases has been found in new locations in the Antelope Valley, and officials are warning residents to take precautions to prevent their spread.
The Aedes mosquitoes were found in two new locations in Palmdale, according to the Antelope Valley Mosquito and Vector Control District. One site is near 35th Street East and Avenue Q-4, and one site is near 37th Street East and Avenue Q. Neither site has recorded this species before, and these are the first two detections of this year.
The Aedes mosquito is not native to the area but was first found here in October 2018. It was traced to Los Angeles, said District Manager Leann Verdick.
SHASTA COUNTY, Calif. – An adult is the first person to test postive for the West Nile Virus in Shasta County this season, according to Shasta Health and Human Services and the Shasta Mosquito and Vector Control District.
The infected person is recovering at home.
West Nile Virus is almost always transmitted to people from the bite of an infected mosquito and cannot be passed through contact with other people or other animals, according to Shasta HHSA.
“West Nile virus is a serious illness spread by mosquitoes in Shasta County. Checking your yard regularly for standing water and protecting yourself from mosquito bites by using an EPA approved insect repellent can dramatically reduce your risk of contracting the disease,” District Manager of the Shasta Mosquito and Vector Control District Peter Bonkrude said.
The Greater Los Angeles County Vector Control District in the USA (GLACVCD) this Thursday the confirmation of the first samples of West Nile virus (WNV) carrier mosquitoes, found this year in the area.
In addition, the entity’s officials indicated that virus activity has steadily increased throughout California. Positive samples were collected from insect traps located in Bellflower, Studio City, and Tarzana, confirming the presence of the virus in mosquito populations within the community.
WNV is a virus transmitted by mosquito bites that causes disease in humans, horses, and birds, which can even be lethal.
Susanne Kluh, director of Scientific-Technical Services at GLACVCD, mentioned that “the West Nile virus is detected every summer by local public health agencies because it is endemic to Los Angeles County. “
For the first time this year, mosquitoes have tested positive for West Nile virus in Los Angeles County, officials said Thursday.
The confirmed samples were from mosquito traps in Bellflower (90706), Studio City (91602), and Tarzana (91356), according to a news release from the Greater Los Angeles County Vector Control District. In addition to the mosquitos, a dead bird found in Valley Village also tested positive.
More samples have been collected, but the results of those are pending.
The discovery of the infected mosquitoes comes amid a steady uptick in West Nile virus activity throughout California recently, according to officials. They noted that the virus is endemic to L.A. County and is detected each summer.
BUTTE COUNTY, Calif. – 24 mosquito pools have tested positive for West Nile virus, as 18 of them tested positive in the last week, the Butte County Mosquito and Vector Control District (BCMVC) said.
The BCMVC said the mosquitos carrying the virus have been found to be widespread on the valley floor of Butte County.
The mosquitos have been collected from Gridley to Hamilton City.
The BCMVC is urging people to drain all unneeded standing water and report any mosquito-breeding sites.
People are also urged to protect themselves from bites by wearing effective repellent, avoid being outdoors during dusk and dawn, and wear long-sleeve shirts and pants.
“With increased WNV activity being reported and identified by neighboring counties and the widespread distribution locally, it’s crucial that residents protect themselves from mosquito bites,” said Doug Weseman, BCMVC Assistant Manager.
IMPERIAL COUNTY — Two local mosquito pools have tested positive for St. Louis encephalitis, the Imperial County Public Health Department announced Friday.
One of the mosquito pools was collected in El Centro near West Main Road just east of Austin Road. The other was in Imperial near the area of La Paz Drive and Puerto Vallarta Avenue. The samples were collected on Tuesday and results were received Friday.
“ As temperatures increase, so do mosquito populations and disease risk, which poses a serious public health threat in our communities,” said Imperial County Health Officer Dr. Stephen Munday. “Residents are strongly encouraged to check around properties and yards for mosquito breeding sources.”
The Public Health Department’s Vector Control Program has approximately 36 mosquito traps placed in strategic areas throughout the county, mostly within city limits. The traps are checked several times a week and mosquito pools are collected weekly.