West Nile Virus: Effects on the Heart and Other Organs

West Nile virus (WNV) is a mosquito-borne illness that usually causes mild, flu-like symptoms. However, in less than 1% of cases, it can invade the central nervous system and other organs, leading to severe complications.

Potential Organ Involvement

Neurological Complications

• Encephalitis: Inflammation of the brain tissue.
• Meningitis: Inflammation of the membranes surrounding the brain and spinal cord.
• Acute flaccid paralysis: Sudden limb weakness resembling polio.

Cardiac Complications

Myocarditis (inflammation of the heart muscle) has been reported in WNV cases. It can cause chest pain, arrhythmias, heart failure, and elevated cardiac enzymes. Though rare, it underscores the virus’s systemic reach.

Hepatic Involvement

Hepatitis (liver inflammation) may occur, presenting with elevated liver enzymes, jaundice, or abdominal discomfort.

Other Organ Effects

• Kidney: Acute kidney injury, rhabdomyolysis.
• Eye: Chorioretinitis, optic neuritis.
• Pancreas: Pancreatitis (rare).

Risk Factors for Severe Disease

• Age over 60
• Immunocompromised status (e.g., transplant recipients, HIV)
• Chronic conditions (diabetes, hypertension, cancer)

Diagnosis and Management

Diagnosis relies on serology (IgM antibodies in serum or CSF) or PCR. No specific antiviral exists; treatment is supportive. Severe cases require hospitalization, often in ICU, for neurological monitoring, hemodynamic support, and management of complications.

Prevention

Avoid mosquito bites: use EPA-registered repellents, wear long sleeves/pants, eliminate standing water, and install screens.