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West Nile Virus

West Nile virus is a mosquito-borne flavivirus virus that can cause encephalitis (inflammation of the brain) or meningitis (inflammation of the lining of the brain and spinal cord).1You're probably wondering "what is a flavivirus?" A flavivirus is a positive-stranded RNA which can be transmitted to humans or animals by infected ticks or mosquitoes. There are about 70 different flaviviruses comprised into one group. The most well known cause yellow fever, dengue, Japanese encephalitis, tick-borne encephalitis, West Nile, Kunjin and St Louis encephalitis virus.2

What is encephalitis and meningitis? Encephalitis is an acute inflammatory process that affects brain tissue and is almost always accompanied by inflammation of the adjacent meninges. The disease is most commonly caused by a viral infection although bacterial infections are possible. The disease affects persons in all age-groups. Furthermore, it can result from a multitude of infectious and noninfectious causes. Depending on the cause, the outcome may be benign or in some cases fatal. Meningitis however is an infection and inflammation of the membranes (meninges) and fluid (cerebrospinal fluid) surrounding your brain and spinal cord. Meningitis is most often caused by bacte


In 2000, it spread to all of the New England states and south to North Carolina. One of the species of mosquitoes found to carry West Nile virus is the Culex species, which survives through the winter, or "overwinters," in the adult stage. That the virus survived along with the mosquitoes was documented by the widespread transmission during the summer of 2000.5

The continued expansion of West Nile virus in the United States indicates that it is permanently established in the Western Hemisphere. It has caused illness and mortality in humans, wildlife and domestic animals, especially birds and horses. In humans, it causes an influenza-like illness that may lead to aseptic meningitis, encephalitis, and death, especially in persons over 50 years of age.7

In conclusion, the West Nile virus has become a serious outbreak in the United States over the past several months. We should definitely take precautions to prevent further outbreaks. Ways that you can do this is avoid unnecessary outdoor activity when mosquitoes are most prevalent, such as dawn, dusk and early evening, wear long sleeves, and use an insect repellent.

Outbreaks of the West Nile virus have occurred before in Egypt, Asia, Israel, South Africa, and in some parts of Europe. West Nile virus was first detected in Uganda in 1937. In the United States, it was first found in New York City in the fall of 1999. During that outbreak, 61 people, including 46 residents of New York City, became ill. Seven people died of West Nile virus-related infections during this initial outbreak. Although it is uncertain how West Nile virus arrived in the USA, the most likely explanation is tha

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Approximate Word count = 1109
Approximate Pages = 4 (250 words per page double spaced)


  

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