Viral Hepatitis Overview
What is hepatitis?
Hepatitis is inflammation of the liver that results in liver cell damage and destruction.
Hepatitis can be categorized in two groups:
- Acute hepatitis
- Chronic hepatitis
There are six main types of the hepatitis virus that have been identified, including the following:
- Hepatitis A. This type of hepatitis is usually spread by fecal-oral contact, or fecal-infected food and water, and may also be spread by blood-borne infection (which is rare). The following is a list of modes of transmission for hepatitis A:
- Consuming food made by someone who touched infected feces
- Drinking water that is contaminated by infected feces (a problem in developing countries with poor sewage removal)
- Touching an infected person's feces, which may occur with poor handwashing
- Outbreaks may occur in large childcare centers, especially when there are children in diapers
- Residents of American Indian reservations or Native Alaskan villages where hepatitis A may be more common
- Sexual contact with an infected person
- Hepatitis B. Hepatitis B (HBV) has a wide range of clinical presentations. It can be mild, without symptoms, or it may cause chronic hepatitis and, in some cases, can lead to liver failure and death. Transmission of hepatitis B virus occurs through body fluid exposure such as blood, semen, vaginal secretions, or saliva. Needle sticks, sharp instruments, sharing items (razors, toothbrushes) and sex with an infected person are primary modes of transmission. Infants may also develop the disease if they are born to a mother who has the virus. Infected children often spread the virus to other children if there is frequent contact, or if a child has many scrapes or cuts. The following describes persons who are at risk for developing hepatitis B:
- Children born to mothers who have hepatitis B (the illness may present up to 5 years after the child is born)
- Children who are born to mothers who have immigrated from a country where hepatitis B is widespread, such as southeast Asia and China
- People who live in long-term care facilities or who are disabled
- People who live in households where another member is infected with the virus
- People who have a blood clotting disorder such as hemophilia
- People who require dialysis for kidney failure
- People who participate in high-risk activities such as intravenous (IV) drug use and/or unprotected heterosexual or homosexual sexual contact
- People who have a job that involves contact with human blood
- People who received blood transfusions or blood products before the early 1990s
A vaccine for hepatitis B does exist and is now widely used for routine childhood immunization. The Centers for Disease Control and Prevention (CDC) now recommends that universal infant hepatitis B vaccination should begin at birth, except in rare circumstances.
- Hepatitis C. The symptoms of hepatitis C are usually mild and gradual. Children often show no symptoms at all. Transmission of hepatitis C occurs primarily from contact with infected blood, but can also occur from sexual contact, or from an infected mother to her baby. Although hepatitis C has milder symptoms initially, it leads to chronic liver disease in a majority of people who are infected. According to the CDC, hepatitis C is the leading indication for liver transplantation. With some cases of hepatitis C, no mode of transmission can be identified.
The following describes persons who may be at risk for contracting hepatitis C:
- Children born to mothers who are infected with the virus
- People who have a blood clotting disorder such as hemophilia and received clotting factors before 1987
- People who require dialysis for kidney failure
- Individuals who received a blood transfusion before 1992
- People who participate in high-risk activities such as intravenous drug use and/or unprotected heterosexual or homosexual sexual contact
- Hepatitis D. This form of hepatitis can occur only in the presence of hepatitis B. If an individual has hepatitis B and does not show symptoms, or shows very mild symptoms, infection with D can put that person at risk for liver failure that progresses rapidly. Hepatitis D can occur at the same time as the initial infection with B, or it may show up much later. Transmission of hepatitis D occurs the same way as hepatitis B, except the transmission from mother to baby is less common.
- Hepatitis E. This form of hepatitis is similar to hepatitis A. Transmission occurs through fecal-oral contamination. It is less common than hepatitis A. Hepatitis E is most common in poorly-developed countries and rarely seen in the United States. There is no vaccine for hepatitis E at this time.
- Hepatitis G. This is the newest strain of hepatitis and very little is known about it. Transmission is believed to occur through blood and is most commonly seen in IV drug users, individuals with clotting disorders such as hemophilia, and individuals who require hemodialysis for renal failure. Often, hepatitis G shows no clinical symptoms and has not been found to be a cause of acute or chronic hepatitis.
How often does hepatitis occur?
According to the CDC, in the United States:
- Hepatitis A rates have declined by 92 percent since the hepatitis A vaccine first became available in 1995.
- An estimated 800,000 to 1.4 million people have hepatitis B infections.
- An estimated 3.2 million people have hepatitis C infections.
|What is Acute Hepatitis?||What is Chronic Hepatitis?|
|Acute hepatitis is quite common in the U.S.
Causes. Common causes of acute hepatitis may include:
Symptoms. Acute hepatitis usually starts with flu-like symptoms. The following are the most common symptoms of acute hepatitis. However, each individual may experience symptoms differently. Symptoms may include:
The symptoms of acute hepatitis may resemble other medical conditions or problems. Always consult your physician for a diagnosis.
Diagnosis. In addition to a complete medical history and medical examination, diagnostic procedures for acute hepatitis may include the following:
Treatment. Specific treatment for acute hepatitis will be determined by your physician based on:
Treatment varies, depending on the type of acute hepatitis (viral versus non-viral). Severe, acute hepatitis may require hospitalization.
People who have had acute viral hepatitis may become chronic carriers of the disease. Proper precautions need to be taken to prevent the spread of the disease.
|Some people do not recover fully from acute hepatitis and develop chronic hepatitis, as the liver continues to sustain more damage and inflammation. Hepatitis is considered chronic if symptoms persist longer than 6 months. Chronic hepatitis can last years.
Types of chronic hepatitis:
Causes. Certain viruses and drugs may cause chronic hepatitis in some people, but not in others. Some common causes include the following:
Symptoms. Symptoms of chronic hepatitis are usually mild. Although the liver damage continues, its progression is usually slow. The following are the most common symptoms of chronic hepatitis. However, each individual may experience symptoms differently. Some individuals may experience no symptoms, while others may experience the following:
The symptoms of chronic hepatitis may resemble other medical conditions or problems. Always consult your physician for a diagnosis.
Diagnosis. In addition to a complete medical history and medical examination, diagnostic procedures for chronic hepatitis may include the following:
Treatment. Specific treatment for chronic hepatitis will be determined by your physician based on:
The goal of treatment is to stop damage to the liver and alleviate symptoms. Treatment may include:
Preventing the spread of viral hepatitis
Proper hygiene is the key to preventing the spread of many diseases, including hepatitis. Other preventive measures include the following:
- Vaccinations. A hepatitis B vaccine is routinely given to toddlers as part of their immunization schedule. A hepatitis A vaccine is available for people at risk. (There are no vaccines for hepatitis C, D, E, or G at this time.)
- Blood transfusion. Blood for transfusions is routinely screened for hepatitis B and C to reduce the risk of infection.
- Antibody preparation. If a person has been exposed to hepatitis, an antibody preparation can be administered to help protect them from contracting the disease.