Hepatitis B

What is Hepatitis B?

Hepatitis B is a viral infection that affects the liver and is caused by the hepatitis B virus (HBV). It can range from a mild, short-term illness (acute hepatitis B) to a serious, lifelong condition (chronic hepatitis B). Chronic hepatitis B can lead to liver damage, cirrhosis, liver failure, or liver cancer.

Transmission of Hepatitis B

Blood-to-blood contact: HBV can be transmitted through contact with infected blood.
Sexual contact: The virus can spread through unprotected sex with an infected person.
Mother to child: HBV can be passed from an infected mother to her baby during childbirth.
Sharing needles: People who share needles or syringes for drug use are at higher risk.
Needle stick injuries: Healthcare workers may contract HBV through accidental needle sticks.

Symptoms of Hepatitis B

Many people with hepatitis B do not show symptoms, especially in the early stages. If symptoms do appear, they can include:

Fatigue
Fever
Loss of appetite
Nausea and vomiting
Dark urine
Joint and muscle pain
Abdominal pain, particularly in the upper right side
Jaundice: Yellowing of the skin and eyes

Acute vs. Chronic Hepatitis B

Acute Hepatitis B:
- Short-term infection that lasts less than six months.
- The immune system can often clear the virus on its own.
Chronic Hepatitis B:
- Long-term infection that lasts six months or longer.
- Can lead to serious liver damage and increase the risk of liver cancer.
- More likely to develop in infants and young children infected with HBV.

Causes and Risk Factors

Unprotected sex: With someone infected with HBV.
Sharing needles: Common among people who use injectable drugs.
Being born to an infected mother
Living with an infected person
Traveling to areas where hepatitis B is prevalent.

Diagnosis

Blood tests: To detect the presence of HBV and determine if the infection is acute or chronic.
Liver function tests: To assess liver damage or inflammation.
HBV DNA test: Measures the amount of virus in the blood.
Liver biopsy: In some cases, a sample of liver tissue may be taken to assess the extent of liver damage.

Treatment Options

Acute Hepatitis B:
- Usually does not require specific treatment as it often resolves on its own.
- Supportive care: Rest, hydration, and monitoring of liver function.
Chronic Hepatitis B:
- Antiviral medications: Such as entecavir, tenofovir, or lamivudine to reduce viral load and prevent liver damage.
- Regular monitoring: To check liver function and disease progression.
- Interferon therapy: In some cases, interferon-alpha may be used to boost the immune response.
- Liver transplant: For severe cases of liver damage or failure.

Prevention Strategies

Safe sex practices: Use of condoms to reduce the risk of transmission.
Avoid sharing needles: Important for people who use injectable drugs.
Screening blood products: Ensures that donated blood is free of HBV.
Hygienic practices: Proper sterilization of medical and dental equipment.

Complications of Hepatitis B

Cirrhosis: Long-term liver damage can lead to scarring of the liver tissue.
Liver cancer: Increased risk in individuals with chronic hepatitis B.
Liver failure: Severe liver damage may result in the inability of the liver to function properly.
Kidney problems: Chronic hepatitis B can sometimes affect the kidneys.
Vascular problems: In some cases, HBV infection can contribute to vascular inflammation.

References & Research

Historical Background

Hepatitis B virus was discovered in 1965 by Dr. Baruch Blumberg, who identified the "Australia antigen" (now known as hepatitis B surface antigen) in the blood of an Australian Aboriginal person. Blumberg was awarded the Nobel Prize in Physiology or Medicine in 1976 for this discovery.

Key Research Papers

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Research Papers

The following PubMed topic searches retrieve current peer-reviewed literature on Hepatitis B. Each link opens a live PubMed query so you always see the most recent publications.