Prevent Mosquito Bites to Prevent West Nile Virus Infection
Seven persons have now been confirmed with West Nile virus illness in Sutter County, with one with
West Nile Fever and six with the more serious neuroinvasive type of West Nile virus (WNV) illness.
The persons live all around the county, reflecting the wide-spread distribution of West Nile virus
activity found by the Sutter-Yuba Mosquito and Vector Control District during this season.
The Sutter-Yuba Mosquito and Vector Control District (SYMVCD) continues to monitor for West Nile
virus activity, but has not detected any positive mosquito samples during the past two weeks.
However, new cases of WNV illness may be diagnosed in the next few weeks due to the lag time from
time of becoming infected with WNV and the development of illness. Current SYMVCD surveillance
and treatment maps are posted online at the
The key to prevention of infection in humans with WNV is prevention of mosquito bites. It is very
important to be vigilant and to take the simple precautions that reduce the risk of mosquito bites.
The 6 “D”s is an easy way to remember how to prevent mosquito bites:
D – DEET – use DEET, picaridin, oil of lemon eucalyptus or IR3535. These are the EPA approved
mosquito repellents to prevent bites; be sure to follow package instructions for age of person
and how to apply
D – Dress to cover arms and legs
D – Dawn and Dusk – avoid going outdoors at dawn and dusk when the mosquitoes that carry WNV are
D – Doors and windows – make sure that the screens on your doors and windows are not broken or
D – Drain all standing water around the outside of your house to reduce numbers of mosquitoes
around you – some common places are gutters, jar lids, tires, flower pot trays
D – District – let the Mosquito Control District know about any standing water, such as
neglected swimming pools.
Most people who become infected with WNV will not develop any symptoms, but approximately one in five
people who are infected with WNV will develop symptoms, such as fever, headaches, body aches, joint
pain, vomiting, diarrhea or rash. Symptoms typically develop from 3 to 14 days after being bitten by
an infected mosquito. Less than one percent of infected people will develop a serious neurologic
illness such as encephalitis or meningitis (inflammation of the brain and surrounding tissues) and
it can be fatal.
The State of California West Nile virus webpage
has information about WNV activity around the state by county, how to report dead birds, and how to
protect against WNV.
For more information about the work that the Sutter County Mosquito and Vector Control District is
doing to reduce numbers of mosquitoes, go to
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