What Causes Hepatitis B?

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what is the differ in hepatitis b  and acute hepatitis  b
Hepatitis B is infection of Hep B virus. When a person gets infected for less than 6 months, it's in the acute phase. A small number of people can clear the virus from the body on their own within the acute phase. Most people get infected and the body can't clear the virus on its own and it becomes the chronic Hepatitis B.
acute hepatitis b means acute attack of symptoms of hepatitis caused by HBV. From the time you get HBV to the onset, the whole course is less than a month.
How do you contract help B
The virus is passed from person to person through blood, semen or other body fluids. It does not spread by sneezing or coughing.

Common ways that HBV can spread are:

Sexual contact. You may get hepatitis B if you have unprotected sex with someone who is infected. The virus can pass to you if the person's blood, saliva, semen or vaginal secretions enter your body.
Sharing of needles. HBV easily spreads through needles and syringes contaminated with infected blood. Sharing IV drug paraphernalia puts you at high risk of hepatitis B.
Accidental needle sticks. Hepatitis B is a concern for health care workers and anyone else who comes in contact with human blood.
Mother to child. Pregnant women infected with HBV can pass the virus to their babies during childbirth. However, the newborn can be vaccinated to avoid getting infected in almost all cases. Talk to your doctor about being tested for hepatitis B if you are pregnant or want to become pregnant.