hepatitis na engleskom

Why get vaccinated against hepatitis B?


Hepatitis B vaccine can prevent hepatitis B, and the serious consequences of HBV infection, including liver cancer and cirrhosis. Routine hepatitis B vaccination of U.S. children began in 1991. Since then, the reported incidence of acute hepatitis B among children and adolescents has dropped by more than 95% and by 75% in all age groups. Hepatitis B vaccine is made from a part of the hepatitis B virus. It cannot cause HBV infection.

Hepatitis B vaccine is usually given as a series of 3 or 4 shots. This vaccine series gives long-term protection from HBV infection, possibly lifelong.

Hepatitis B is a serious disease. The hepatitis B virus (HBV) can cause short-term (acute) illness that leads to: loss of appetite, diarrhea and vomiting, tiredness, jaundice (yellow skin or eyes), and pain in muscles, joints, and stomach. It can also cause long-term (chronic) illness that leads to: liver damage (cirrhosis), liver cancer, or death. About 1.25 million people in the U.S. have chronic HBV infection.


Hepatitis B virus



Hepatitis B virus is 100 times more contagious than human immunodeficiency virus (HIV), which causes AIDS.
It is spread through sexual activity and by contact with blood and other body fluids.
The effects range from flu-like illness, nausea, and vomiting to cirrhosis and liver cancer. Statistics from the U.S.
Centers for Disease Control and Prevention indicate that 14 Americans die every day from hepatitis B and more than one-third of the 300,000 people infected are college-aged young adults.

Hepatitis HBV virus I


Causes

The hepatitis B virus spreads through blood, semen, vaginal fluids, and other body fluids.

Infection can occur if you have:

  • Blood transfusions
  • Contact with blood in health care settings
  • Had direct contact with the blood of an infected person by touching an open wound or being stuck with a needle
  • Had unprotected sex with an infected person
  • Received a tattoo or acupuncture with contaminated instruments
  • Shared needles during drug use
  • Shared personal items (such as toothbrushes, razors, and nail clippers) with an infected person

The hepatitis B virus can be passed to an infant during childbirth if the mother is infected.

Other risk factors for hepatitis B infection include:

  • Being born, or having parents who were born in regions with high infection rates (including Asia, Africa, and the Caribbean),nfection can occur if you have
  • Having multiple sex partners
  • Men having sex with men
  • Being on hemodialysis
  • Being infected with HIV

Hepatitis B infections may be acute or chronic.

  • Acute hepatitis B is the 3 - 6 month period after becoming infected.
  • Chronic hepatitis B is when the hepatitis B virus remains in a person's body. These people are considered to be carriers of hepatitis B, even if they do not have any symptoms.

Most of the damage from the hepatitis B virus is due to the body's response to the infection. When the body's immune system detects the infection, it sends out special cells to fight it off. However, these disease-fighting cells can lead to liver inflammation.


How does liver damage occur in hepatitis C infection?



The presence of HCV in the liver triggers the human immune system, which leads to inflammation. Over time (usually decades), prolonged inflammation may cause scarring. Extensive scarring in the liver is calledcirrhosis.

When the liver becomes cirrhotic, the liver fails to perform its normal functions, (liver failure), and this leads to serious complications and even death. Cirrhotic livers also are more prone to become cancerous.

How is hepatitis C virus spread and how can transmission be prevented?

HCV is spread (transmitted) most efficiently through inadvertent exposure to infected blood.

  • The most common route of transmission is needles shared among users of illicit drugs.

  • Accidental needle-sticks in healthcare workers also have transmitted the virus.

  • The average risk of getting HCV from a stick with a contaminated needle is 1.8% (range 0% to 10%).

  • Prior to 1992, some people acquired the infection from transfusions of blood or blood products. Since 1992, all blood products are screened for HCV, and cases of HCV due to blood transfusionnow are extremely rare.

  • HCV also can be passed from mother to unborn child. Approximately 4 of every 100 infants born to HCV-infected mothers become infected with the virus.

  • A small number of cases are transmitted through sexual intercourse. The risk of transmission of HCV from an infected individual to a non-infected spouse or partner without the use ofcondoms over a lifetime has been estimated to be 1% to 4%

  • Finally, there have been some outbreaks of HCV when instruments or sharp tool have been re-used without appropriate cleaning between patients.

Transmission of HCV can be prevented in several ways.

  • Programs have been aimed at avoiding needle sharing among drug addicts. Needle exchange programs and educational interventions have reduced high-risk behaviors. However, the population of drug addicts is a difficult population to reach, and rates of HCV remain high among addicts (30% of younger users).

  • Among healthcare workers, safe needle-usage techniques have been developed to reduce accidental needle-sticks. Newer syringes have self-capping needle systems that avoid the need to manually replace a cap after drawing blood and reduce the risk of needle-sticks.

  • There is no clear way to prevent transmission of the HCV from mother to child.

  • Persons with multiple sexual partners should use barrier precautions such as condoms to limit the risk of HCV as well as other sexually-transmitted diseases.

  • Monogamous couples should consider the low risk of transmission when deciding whether to use condoms during intercourse. Some couples may decide to use them and some may not.

  • Screening tests for blood products have almost eliminated the risk of transmission through transfusion, estimated by the CDC to be less than one in two million transfused blood products.

  • People with HCV should not share razors or toothbrushes with others.

  • It is critical that physicians and clinics follow manufacturer's directions for sterilizing/cleaning instruments and that disposable sharp instruments be discarded properly.

It is important to realize that HCV is not spread by casual contact. Thus, shaking hands, kissing, and hugging are not behaviors that increase the risk of transmission. There is no need to use special isolation procedures when dealing with infected patients.

ą
Midhat Mido,
22. kol 2010. 13:59
Comments