2002). WNV can be confused with dengue infection. Alternate routes of human infection have been documented in the case of blood transfusions, organ transplants, exposure in a laboratory setting, and vertically during pregnancy. Of the 49 patients in the study, 11 (22%) had been diagnosed with West Nile meningitis or encephalitis and 38 (78%) had been diagnosed with West Nile fever. Between 1999 and 2001, West Nile Virus infection remained confined to the eastern United States with a total of 149 cases reported. The viral strain introduced into the United States likely originated from a strain that was circulating in Israel during 1998 (Lanciotti et al., 1999). While West Nile virus can infect many animals (its impact on horses is commonly cited), it most frequently afflicts birds – and the presence of dead birds in a community can be a harbinger of a West Nile virus outbreak.

False-positive results, which show that you have the virus when in fact you do not, can occur if you have been infected with a similar virus, such as the St. Most often, mosquitoes spread the virus by biting birds infected with the virus and then biting people. WNV and other arboviruses continue to cause serious illness in substantial numbers of persons annually. Humans and mammals are usually incidental, dead-end hosts as viral titers in mammals are insufficient to infect mosquitoes for further transmission to other mammals [8]. West Nile virus historically was largely confined to Africa, the Middle East, and parts of Russia, India, and Indonesia, where it caused occasional, usually minor, epidemics of denguelike illness or sporadic encephalitis. WN virus is an arthropod-borne virus belonging to the Japanese encephalitis complex of the Flavivirus genus (4). But at least 110 other bird species also have the virus.

Very recently, evidences of West Nile Virus has been found in alligators in Miami. A: Usually 3 to 15 days. A routine outpatient assessment performed 1 week earlier had revealed no abnormalities. State governments should establish abatement programs that will eliminate sources that allow for mosquito reproduction and harboring. A large multistate outbreak of WNV disease accounted for 5,674 (98%) of reported cases, the highest number reported since 2003. But permanent problems such as seizures, memory loss, and brain damage can occur, especially in children and older people. Meningitis is inflammation of the membranes surrounding the brain and spinal cord.

In a collection in New York in 1999, 55% of clinically infected individuals died; however further serological studies showed that the dead birds totalled only 11.7% of the 94 birds which had been infected. Mosquitoes act as the transmitting vector for the virus, and infected birds, especially corvids (crows and jays), are the reservoir of the disease. This mosquito is widely distributed west of the Mississippi River. Hayes EB, Sejvar JJ, Zaki SR, Lanciotti RS, Bode AV, Campbell GL. Cultures of cerebrospinal fluid, blood, and urine had no growth. More studies are needed to document the long-term sequelae of this increasingly common infection. Between 1999 and 2001, West Nile Virus infection remained confined to the eastern United States with a total of 149 cases reported.

However, focal symptoms, localized to an anatomical region of the peripheral nervous system or the CNS, were only described in a limited number of reports before the 2002 outbreak occurred [3–5]. However, these medications did not help the patients, and in some instances, they made conditions worse. It is expected that WNV will continue to extend its range within the western hemisphere. Keywords: Acute hemorrhagic conjunctivitis, meningoencephalitis, subconjunctival hemorrhages, West Nile Virus Case Report A 40-year-old male presented with confusion, short-term memory loss, and unsteady gait for one month. While this is an important disease to be aware of there are some very basic steps that can be taken to protect you from infection. “Moreover, many West Nile patients may not have an overt meningitis or encephalitis syndrome as would be expected. Advanced age is the most important risk factor for neurological disease leading most often to poor prognosis in those afflicted.

Less than 1% of people bitten by an infected mosquito will become seriously ill. In 2006, over 4000 WNV infections were treated in the US, with 174 fatalities reported. METHODS: We reviewed the MR imaging findings of 17 patients with confirmed WNV encephalitis and/or myelitis. People primarily get West Nile from the bite of a mosquito that is infected with WNV. This report describes six cases of WNV-associated AFP in which clinical and electrophysiologic findings suggest a pathologic process involving anterior horn cells and motor axons similar to that seen in acute poliomyelitis. PMCID: PMC2958550 This article has been cited by other articles in PMC.Abstract Twenty-nine laboratory-confirmed West Nile virus (WNV) encephalitis patients were bled serially so that WNV-reactive immunoglobulin (Ig) M activity could be determined. PMCID: PMC4755400 This article has been cited by other articles in PMC.Abstract West Nile virus (WNV), a neurotropic single-stranded flavivirus has been the leading cause of arboviral encephalitis worldwide.