New In This Update
- More humans, crows and mosquitoes have tested positive for the presence
- In total, 163 residents have been approved for WNV testing this season.
Blood and/or spinal fluid samples from these individuals are in the
process of being tested for the presence of WNV. These individuals either
had symptoms or signs that met the established WNV testing criteria
or exhibited most of the symptoms and are from counties where dead crows
and/or mosquitoes with the virus have been discovered.
- To date, 65 are negative, 27 tests on people are pending, 53 for which
no specimen was submitted for testing, and 18 positive.
- Human testing for WNV is being conducted at the New Jersey Department
of Health and Senior Services' Public Health and Environmental Laboratory
in Trenton and at public health labs in other states. Testing results
are sent to the CDC for confirmation.
Crow, American Kestrel and Other Bird and Small Mammal Testing
- To date, 1,064 crows have been accepted for testing by the Department
of Health and Senior Services' Public Health and Environmental Laboratory.
Of those tested, 798 crows found in 20 counties have been confirmed
positive for the presence of WNV. Positive crows have been found in
Atlantic (31), Bergen (85), Burlington (61), Camden (26), Cape May (4),
Cumberland (19), Essex (9), Gloucester (56), Hunterdon (12), Mercer
(43), Middlesex (51), Monmouth (157), Morris (79), Ocean (70), Passaic
(25), Salem (18), Somerset (24), Sussex (2), Union (18), and Warren
- The department has also received 778 bird samples (mostly crows) deemed
unsatisfactory for testing and has been notified of 1,593 dead or ill
birds (mostly crows) not submitted for testing due to their condition.
- To date, 9,249 mosquito pools have been tested in the state laboratory
for the presence of WNV and 479 pools found in 21 counties have tested
positive for WNV. Positive mosquitoes were collected in Atlantic (25)
Bergen (111), Burlington (11), Camden (5), Cape May (2), Cumberland
(38), Essex (15), Gloucester (20), Hudson (5), Hunterdon (9), Mercer
(4), Middlesex (37), Monmouth (39), Morris (30), Ocean (23), Passaic
(41), Salem (13), Somerset (21), Sussex (15), Union (11) and Warren
- Equine testing is conducted by the New Jersey Department of Agriculture's
animal health laboratory in Trenton and positive results are sent to
the National Veterinary Services Lab (NVSL) in Ames, Iowa for confirmation.
For more information, visit the Department of Agriculture website at
Additional Information & Advisories
- The West Nile virus, an arboviral disease, is transmitted through
the bite of a mosquito that has picked up the virus by feeding on an
infected bird. WNV is not directly transmitted from birds to humans.
WNV infection generally causes no symptoms or just mild, flu-like symptoms;
however, the elderly are at higher risk of more severe disease.
- Between 1999 and 2001, lab testing confirmed WNV infection in 18
New Jersey residents, with two resulting fatalities. The virus has also
been detected in mosquitoes, horses, or crows and other birds in every
county in New Jersey.
- New Jersey's WNV surveillance, control and prevention activities
involve the coordinated efforts of a number of federal, state and local
agencies. These include the New Jersey Departments of Health and Senior
Services, Environmental Protection, and Agriculture, the CDC, the State
Mosquito Control Commission, the Rutgers Mosquito Research and Control
Unit, and local health and mosquito control agencies.