Actually uncommon. Most west nile infections are asymptomatic. Some cause mild flu-like symptoms. Full blown infection of brain is rather uncommon in the normal patient and more often seen with immuno-suppression, such as prior transplants, HIV pts, cancer chemotherapy. The polio-myelitis form is even rarer.
West Nile Virus. West nile virus travels through an insect vector. The virus will undergoe a viremia state during which it is spread to organs throughout the body, including the brain.
1 in 150. Only 1 in 150 patients infected with the west nile virus develop encephalitis. West nile fever is much more common and is typically a self-limited disease. Individuals more susceptible to developing encephalitis from a west nile infection include the elderly, alcoholics and diabetics.
Yes. West nile virus, transmitted by mosquito bites, can cause encephalitis, inflammation in the brain. There is no vaccine available to protect a person from west nile virus.
Yes. West nile virus is caused by an infection transmitted via a mosquito bite. Many people may be exposed to the virus but never develop symptoms. When symptoms do develop, it is typically fever and headache although more severe symptoms may occur. The cdc has info on west nile activity nationwide: http://www. Cdc. Gov/ncidod/dvbid/westnile/index. Htm.
Variable. A case of West Nile virus with encephalitis recover but takes long time, prolonged recuperation and need rehabilitation for a long time. They may have some memory loss or weakness of limbs.
Hard to say. Some studies have quoted mortality from neuroinvasive cases of wnv ~5%, but this must be a huge overestimate. Maybe 3 in 1000 of all cases are severe (or neuroinvasive), so you might guess less than 1 in 5000 cases die. Most of the deaths appear to come in the elderly, chronically ill or immunosuppressed. Treatment is mainly supportive (including intubation & ventilation in severe cases).
Yes. Absolutely, in recent years west nile virus has been in epidemic mode sweeping from the east coast of the us to the west. Encephalitis is present only in severe cases.
Mosquito bites. West nile virus must be produced in high numbers before being passed through mosquitoes. Birds are far and away the most frequent carriers. Robins look like they might be responsible for spread all over the country. Mosquitoes have to feed on the infected robin and then pass the virus on to human beings through a bite.
Most no symptoms. 80% of people infected have no symptoms. If you develop symptoms of severe west nile virus illness, such as unusually severe headaches or confusion, seek medical attention immediately, according to the cdc. Severe illness usually requires hospitalization. Milder cases improve on their own and do not necessarily require medical attention.
Yes. Yes, and more so in areas that have had warm winters, spring, and hot summers. Dallas is the prime example. It can cause a mystery illness in many, but can kill the elderly and children, or those with a weakened immune system. West nile has been found in many areas of knoxville, tn, where I live! Use repellent.
The Robin. West nile virus must be produced in high numbers before being passed through mosquitoes. Birds are far and away the most frequent carriers. Robins look like they might be responsible for spread all over the country. Mosquitoes have to feed on the infected robin and then pass the virus on to human beings through a bite.
No. In fact, most people who get wnv infections don't die. Must people who do are the very young, the elderly, the immunocompromised, or someone with a genetic predisposition. However, a person with an encephalitis that is not appropriately managed supportively, can be at risk of dying if the brain herniates through the bottom of the skull.
Not always. Many previously healthy people who acquire west nile encephalitis will recover. Those most likely to die are the elderly and those with compromised immune systems.
Non-specific... Good question. Some people don't develop a rash while others do. Unfortunately, there is no characteristic rash to wnv. It will typically form a light, red sometimes lacy rash cornering most of the body- this is what is known as a viral "xanthem".
West Nile Virus. The rash seen with West Nile Virus Fever tends to be a non-specific maculopapular rash that appears between days 5 to 12 of acute illness.
CDC recommends. • use mosquito repellent with deet • dress in long pants and long sleeves • be especially careful at dusk and dawn • drain any standing water cdc recommendations.
Avoid mosquitoes. Mosquito safety- use bed netting when sleeping. Spray the walls of the home with insecticide. Wear long pants & long sleeved shirts from dusk to dawn. Use Permethrin spray on clothing and mosquito netting. Deet agents can be used on skin.