West Nile virus (RNA, qualitative, plasma)

West Nile Virus (plasma, RNA, qualitative) is a molecular genetic test used to detect West Nile virus RNA in a plasma sample using the polymerase chain reaction (PCR) method.

West Nile virus belongs to the flavivirus group and is mainly transmitted through the bites of infected mosquitoes. In most people, the infection is asymptomatic or causes mild flu-like symptoms. In some cases, the virus can affect the central nervous system and lead to severe neurological complications.

The test detects viral genetic material in the blood and is used for the diagnosis of active infection, especially during the early stages of the disease.

Indications

The test may be recommended for:

• suspected West Nile virus infection;
• fever accompanied by headache, weakness, and muscle pain;
• neurological symptoms such as altered consciousness, seizures, severe weakness, or neck stiffness;
• patients with symptoms suggestive of meningitis or encephalitis;
• individuals who have stayed in regions where West Nile virus is present;
• mosquito bites accompanied by characteristic symptoms;
• investigation of unexplained fever.

What does the test detect?

The PCR method detects the presence of West Nile virus RNA in blood plasma.

A positive result indicates that viral genetic material has been detected in the tested sample and may suggest an active infection.

A negative result means that viral RNA was not detected in the sample. The result should be interpreted by a physician considering the stage of infection, symptoms, and other laboratory findings.

Since the virus is mainly present in the bloodstream during the early phase of infection, serological testing for IgM and IgG antibodies may also be recommended by a physician.

Procedure

The test is performed using a venous blood sample.

After plasma separation, the laboratory performs PCR analysis to detect specific RNA sequences of West Nile virus.

The test is safe and requires only a standard blood draw.