![]() ![]() They are present in most individuals within 8 days of the initial exposure. IgM antibodies are the first to be produced by the body in response to a WNV infection. There are two types of WNV antibodies: IgM and IgG. Testing involves measurement of WNV antibodies, specific proteins created by the body’s immune system in response to a WNV infection, or measurement of WNV nucleic acid, genetic material from the virus itself. Detecting the presence of WNV in the community can alert health providers and promote prevention measures. WNV testing is also used in the US and Canada to screen units of blood for the virus, to detect WNV infection in the blood of living tissue and organ donors, and to track the spread of WNV through a community and across the country. Testing of symptomatic and seriously ill patients can help distinguish WNV from other conditions (such as bacterial meningitis) causing similar symptoms. West Nile virus (WNV) testing is used to determine whether someone is currently or has recently been infected with WNV. Is any test preparation needed to ensure the quality of the sample? How is the sample collected for testing?Ĭerebrospinal fluid (CSF) is collected from a spinal tap and/or a blood sample is taken from a vein in your arm. While most symptoms resolve within several weeks, some nerve damage and paralysis may linger or be permanent. ![]() This serious form of WNV is much more common in the elderly and in the immunocompromised. They may have encephalitis and/or meningitis and/or may experience muscular paralysis. These patients frequently experience severe symptoms such as confusion, convulsions, high fever, neck stiffness, headaches, or a coma. Only about 1 in 150 people infected with WNV becomes seriously ill with an infection that affects the central nervous system. These symptoms usually resolve without treatment within a few days to a few weeks. In the other 20%, it causes flu-like symptoms such as headache, fever, nausea, muscular weakness, and/or a skin rash on the back or chest. About 80% of the people infected with WNV experience no symptoms. It is not usually transmitted person-to-person, but there have been cases of WNV being passed on to others through blood donations, organ transplants, and rarely from a mother to child through breast milk. West Nile virus (WNV) is an infection that is transmitted to humans primarily by mosquitoes. ![]() We are not a laboratory and are unable to comment on an individual's health and treatment. Lab Tests Online-UK is an educational website designed to provide patients and carers with information on laboratory tests used in medical care. If you are concerned about your test results, you will need to arrange an appointment with your doctor so that all relevant information including age, ethnicity, health history, signs and symptoms, laboratory and other procedures (radiology, endoscopy, etc.), can be considered. If the doctor wants to see you about the result(s), you will be offered an appointment. Your GP practice will be able to provide specific details. If you are registered to use the online services of your local practice, you may be able to access your results online. The X-ray & scan results may take longer. Some specialist test results may take longer, if samples have to be sent to a reference (specialist) laboratory. On average it takes 7 working days for the blood test results to come back from the hospital, depending on the exact tests requested.
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