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Memphis, TN

West Nile Virus in Memphis, TN: Local Ecology, Public Health Impact, and Seasonal Risk

The Local Climate: Why Memphis is an Ideal Habitat

The humid subtropical climate of Memphis creates optimal conditions for mosquito breeding and survival.

  • Temperature and Humidity: Memphis experiences hot, humid summers and mild winters, which contribute to a lengthy mosquito season extending from late spring into early fall.
  • Topography and Water Sources: Consistent rainfall and the city’s proximity to the Mississippi River mean that standing water is frequently available in storm drains, ditches, and extensive green spaces.

These environmental factors specifically support the proliferation of the Culex mosquito species, which is the primary vector for West Nile Virus in the Mid-South.

Memphis Hero Image Mosquito Shield of Memphis TN

Seasonal Trends and National Climate Variations

Mosquito activity and the associated risk of West Nile Virus are highly dependent on seasonal weather patterns, which vary significantly across the United States:

  • The Mid-South (Memphis, TN): The mosquito season is extended. While mosquito activity begins in the spring, historical data indicates that most human cases of West Nile Virus in Shelby County occur during the peak months of August and September. Spring rains followed by intense midsummer heat accelerate the mosquito lifecycle, leading to rapid population spikes by late summer.
  • The Northeast and Midwest: Mosquito seasons in these regions are generally much shorter, heavily restricted by earlier first frosts and longer, colder winters that naturally disrupt the breeding cycle.
  • The Deep South and Florida: Mosquito activity can be nearly year-round due to the lack of hard freezes, making vector-borne disease monitoring a continuous, 12-month effort.

Humid Day

Public Health Impact on the Memphis Population

The Shelby County Health Department actively monitors West Nile Virus activity through vector surveillance, including trapping and testing local mosquito pools.

  • Transmission and Symptoms: Humans contract the virus when bitten by an infected mosquito. While many infections are asymptomatic, mild cases can result in fever, headaches, and body aches lasting a few days.
  • Vulnerable Demographics: The virus poses a higher risk for severe disease—including neurological conditions—in individuals over the age of 50 and those with compromised immune systems.
  • Local Incidence: The presence of the virus is closely tracked year over year. The health department regularly reports when mosquitoes test positive for WNV in various local ZIP codes, and human cases are actively documented to gauge the severity of the season.

WNV Vector Sign

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    Vector Ecology: How the Virus Spreads

    West Nile Virus is maintained in a transmission cycle between mosquitoes and birds. Mosquitoes become infected by feeding on infected birds, and then pass the virus to humans and other mammals during subsequent blood meals.

    To mitigate the spread, local authorities often employ integrated mosquito management strategies:

    • Larviciding: Applying environmentally targeted treatments to standing bodies of water to prevent mosquito larvae from developing into biting adults.
    • Adulticiding: Conducting targeted, truck-mounted treatments in specific ZIP codes when surveillance indicates a high concentration of infected adult mosquitoes.

    standing water near home where mosquitoes can breed

    Frequently Asked Questions

    01. What other insects will this affect?
    We use a control product so other insects present when and where we spray may be impacted.

    However, our formula was specifically engineered for mosquitoes so it won’t repel any other insects as it does mosquitoes.
    02. Will your product work after storms?
    Yes, we have specifically engineered our formula to outlast storms. With a special polymer layer that provides weather resistance, our formula will remain effective.
    03. Is there any environment you cannot treat?
    Yes, there are some areas we won’t spray to avoid the surrounding environments. Pools, natural water sources, vegetable gardens, and artificial water sources complete the list.

    Because water could easily spread the insecticides, we never directly apply our product to it. However, the rest of the property can still be sprayed and it will drastically reduce the population of mosquitoes.
    04. Does this product work on all mosquitoes and ticks ?
    Yes, we target aspects of mosquitoes and ticks that don’t change from species to species.

    The killing and repelling aspects of our product will work on any species of mosquitoes and ticks .
    05. What about my children and pets?
    Pets and children should be inside during each application. However, they can re-enter the property once the product has dried, roughly 10-15 minutes. At that point, there are no restrictions until the next application.
    06. When can I start to see the effects?
    Every yard is different but you should notice a dramatic reduction within 24-48 hours of the initial spray.

    With each subsequent treatment, the results continue to improve, allowing you to enjoy time outside without being chased in by swarms of mosquitoes.
    07. Why do we see more mosquitoes after it has rained?
    Mosquitoes are more abundant after it rains because standing water is where they breed.

    Adult, female mosquitoes will lay their eggs in water. Once fully submerged, the countdown begins and the eggs can hatch in as little as a few days.

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