Hepatitis D

INTRODUCTION

Hepatitis D, also known as delta hepatitis, is a liver disease caused by the hepatitis D virus (HDV). This infection leads to inflammation of the liver, which can impair its function and may result in long-term complications such as cirrhosis and liver cancer.

HDV infection is relatively uncommon in developed countries like the United States but is more prevalent in regions such as:

• South America
• West Africa
• Russia
• Pacific Islands
• Central Asia
• Mediterranean regions

HDV is considered a defective or satellite virus, as it can replicate only in the presence of the hepatitis B virus (HBV). Therefore, it occurs only in individuals already infected with HBV. Both co-infection (simultaneous infection) and superinfection (HDV infection in an existing HBV patient) tend to produce more severe disease compared to HBV infection alone.

CAUSE

Hepatitis D is caused by infection with the hepatitis D (delta) virus, which requires HBV for its survival and replication.

RISK FACTORS

The risk of acquiring HDV is higher in individuals who:

• Are already infected with hepatitis B
• Engage in high-risk sexual practices
• Receive frequent blood transfusions
• Use intravenous drugs with shared needles

MODE OF TRANSMISSION

HDV spreads through direct contact with infected body fluids, including:

• Blood
• Semen
• Vaginal secretions
• Urine
• Mother-to-child transmission during childbirth

A person can only develop hepatitis D if they are already infected with hepatitis B. Approximately 5% of HBV-infected individuals may acquire HDV infection. Transmission can occur either:

• Along with HBV (co-infection), or
• After HBV infection (superinfection)

CLINICAL MANIFESTATIONS

Hepatitis D may sometimes be asymptomatic. When symptoms are present, they may include:

• Jaundice (yellow discoloration of skin and eyes)
• Joint pain
• Abdominal pain
• Nausea and vomiting
• Loss of appetite
• Dark-colored urine
• Fatigue

The symptoms are often similar to hepatitis B, making differentiation difficult. In some cases, HDV infection can worsen the severity of HBV symptoms or trigger symptoms in previously asymptomatic HBV patients.

DIAGNOSIS

• Detection of anti-HDV antibodies in blood confirms exposure to the virus
• Liver function tests (LFTs) help assess liver damage by measuring:
  • Liver enzymes
  • Bilirubin levels
  • Protein levels

These tests help determine the extent of liver injury and overall liver function.

MANAGEMENT

• There is no definitive treatment available for hepatitis D.
• Standard antiviral drugs are generally less effective.
• Interferontherapymaybeusedforupto12monthstocontrolviralreplication,though response rates vary.
• You should also remain proactive by watching for recurring symptoms.

In advanced cases:

• Patients with cirrhosis or severe liver damage may require a liver transplant
• Liver transplantation can significantly improve survival, with many patients living 5 years or more post-surgery

COMPLICATIONS

If left untreated, hepatitis D can lead to serious complications such as:

• Cirrhosis (scarring of the liver)
• Chronic liver disease
• Hepatocellular carcinoma (liver cancer)

Early diagnosis and monitoring are crucial to prevent disease progression and liver damage.