Hepatitis B is an infectious liver disease caused by the hepatitis B virus (HBV), which is transmitted through blood and body fluids. Hepatitis B can occur in both acute and chronic forms. The acute form of the disease is often asymptomatic or manifests itself with mild, non-specific symptoms such as fatigue, mild jaundice, and dyspeptic disorders. Chronic hepatitis B can lead to serious complications such as cirrhosis and primary liver cancer. There is a vaccination against hepatitis B, which is effective in preventing the disease.
History of the disease and interesting historical facts
Hepatitis B has been known to mankind for several centuries. At the beginning of the 20th century, links between blood transfusions and the development of hepatitis were revealed, but the virus was discovered only in 1965 by serological analysis. In 1970, the virus was isolated, which was later named HBV. In 1986, the first vaccine against hepatitis B was developed, which significantly reduced the incidence of the disease among the population in developing countries. An additional interesting fact is that in some cultures, such as the Japanese, hepatitis B is perceived as a serious social problem and a genetic predisposition to the virus is considered a sign of misfortune.
Epidemiology
According to the World Health Organization, about 257 million people in the world live with chronic hepatitis B. The incidence varies depending on the region: the highest prevalence is observed in Africa and East Asia. According to statistics, in some countries, for example, in China, about 10% of the population are carriers of the hepatitis B virus. In Russia, according to Rospotrebnadzor, the number of chronic carriers is approaching 5 million. Epidemiological studies show that most cases of transmission of the virus occur through unprotected sexual intercourse, as well as through contact with infected blood.
Genetic predisposition to this disease
Scientists have found that the presence of certain genes can increase susceptibility to hepatitis B. In particular, polymorphisms in genes responsible for the immune response, such as HLA-DQ and HLA-DR, are being studied. Also, the results of some studies show a link between mutations in the IFNL3 gene and the likelihood of developing chronic hepatitis B. Genetic predisposition varies among different ethnic groups and may depend on the coexistence of other infectious diseases, such as HIV.
Risk factors for the development of this disease
Risk factors for developing hepatitis B can be divided into several categories:
- Physical factors:
- Contact with contaminated blood (for example, during transfusions, using a shared syringe);
- Unprotected sexual intercourse with foreign partners.
- Chemical factors:
- Use of certain medications (eg, immunosuppressants);
- Contact with toxic substances that affect the liver.
- Social factors:
- Living in regions with high incidence of the disease;
- Lack of vaccination in childhood.
Diagnosis of this disease
Acute forms of hepatitis B are often asymptomatic, but there are a number of key clinical manifestations that may indicate the disease:
- Fatigue and weakness;
- Liver pain;
- Jaundice;
- Nausea and vomiting;
- Dark colored urine;
- Light chair.
Laboratory tests include determination of hepatitis B virus markers (HBsAg, anti-HBc, anti-HBs) and assessment of alanine aminotransferase (ALT) levels. Radiological examinations, such as liver ultrasound, help assess the condition of the organs. Differential diagnosis should be made with other types of hepatitis and liver diseases.
Treatment
Treatment of hepatitis B can be classified as general or pharmacological. General measures include rest, diet, and increased fluid intake. Pharmacological treatment aims to suppress viral replication and may include nucleoside analogue drugs such as tenofovir and entecavir. In severe cases, surgery such as liver transplantation may be required. Immunotherapeutic methods such as vaccination are also used.
List of medications used to treat this disease
Among the main drugs used to treat hepatitis B, the following can be distinguished:
- Tenofovir;
- Entecavir;
- Lamivudine;
- Adefovir;
- Pegylated interferon alpha-2a.
Disease monitoring
Monitoring of patients with hepatitis B includes regular checks of ALT levels, viral load, and liver ultrasound. Comprehensive monitoring helps identify potential complications such as cirrhosis and liver cancer, which significantly improves the prognosis for patients. Complications may arise as the disease becomes chronic, which requires careful monitoring of the condition.
Age-related features of the disease
Hepatitis B can progress differently in different age groups. In newborns and young children, the infection often becomes chronic. In adults, the possibility of self-healing from acute hepatitis exceeds 90%. In elderly patients, hepatitis B is often accompanied by concomitant diseases, which requires special attention during treatment.
Questions and Answers
- How is hepatitis B transmitted? Hepatitis B is transmitted through blood, biological fluids, and also during unprotected sexual intercourse.
- Can you get hepatitis B from a needle stick? Yes, using unsterile needles and syringes is one of the main ways the virus is transmitted.
- Is there a vaccine against hepatitis B? Yes, there is a highly effective vaccine that provides reliable protection against the virus.
- What are the symptoms of chronic hepatitis B? Chronic hepatitis B may not cause symptoms, but in some cases fatigue, dark urine, and jaundice may occur.
- What is the chance of recovery from hepatitis B? An acute case of hepatitis B in adults almost always ends in recovery, while in newborns the probability of developing a chronic form is much higher.
Advice from Dr. Oleg Korzhikov
According to Dr. Oleg Korzhikov, it is important to monitor your health and undergo regular check-ups, especially if you are in a risk group. "You should not ignore symptoms such as chronic fatigue or changes in urine color. It is best to get tested and check your condition. Prevention is always more important than treatment," he noted.
