Monday, May 23, 2022

What Is The Hepatitis B Shot For

Us Infant Hepatitis B Vaccine Schedules

Does HepB Vaccine Cause Defects?
*Please note that the first dose should be given as soon as possible. Additional doses require minimum time intervals between doses in order for the vaccine to be effective.
3-Dose Vaccine Series for Infants

Since 1991, ALL medically stable infants with a birth weight of at least 2,000 g in the U.S. are recommended to receive the first dose of hepatitis B vaccine within 24 hours of birth. The additional 2 doses are given at 1 month and 6 months of age.

4-Dose Vaccine Combination Series for Infants

Combination vaccines, such as the pentavalent and hexavalent vaccines, include protection against 5 or 6 diseases, including hepatitis B. The first shot is usually given at 6 weeks of age, but in order to protect infants from hepatitis B beginning at birth, a monovalent or single dose of the hepatitis B vaccine is also recommended within 24 hours of birth. The hepatitis B vaccine series can then be completed with the pentavalent or hexavalent vaccine with the recommended schedule.

What Other Drugs Will Affect Hepatitis B Vaccine

Before your child receives this vaccine, tell the doctor about all other vaccines your child has recently received.

Other drugs may interact with hepatitis B vaccine, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.

Concurrent Administration Of Vaccines

HB-containing vaccines may be administered concomitantly with other vaccines or with HBIg. Different injection sites and separate needles and syringes must be used for concurrent parenteral injections.

Refer to Timing of Vaccine Administration in Part 1 for additional information about concurrent administration of vaccines.

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Active Vaccination To Prevent Infection

Hepatitis B vaccination is available for preexposure and postexposure prophylaxis and provides long-term protection. Hepatitis B vaccines are produced recombinantly in yeast cell systems. The vaccines contain noninfectious HBsAg , a small amount of yeast protein, and aluminum hydroxide as an adjuvant. Pediatric formulations contain trace or no thimerosal. Administration is via the intramuscular route. Adverse effects are generally mild and mainly consist of local tenderness and low-grade fever. After a vaccine series, more than 95% seroconversion is achieved, which results in > 90% efficacy. Studies are ongoing to determine length of immunity, but it is at least 20 years.

Two hepatitis B single antigen vaccines are available in the United States: Recombivax from Merck & Co. and Engerix-B from GlaxoSmithKline. Both vaccines come in doses for pediatric and adult populations. High-dose vaccines are available for adult hemodialysis and immunocompromised patients. Both vaccines are given in a three-dose series and are generally interchangeable. A fourth dose may be given if a birth dose was administered. The birth dose must be a single antigen formulation.

Booster doses of hepatitis B vaccine beyond the initial series are generally not recommended. The long incubation period of hepatitis B theoretically allows for the development of a protective anamnestic immune response after exposure.

Fabrizio Fabrizi MD, … Paul Martin MD, in, 2017

Important Information About Vaccine And Hepatitis B Immunoglobulin Shot Administration

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Where available, the hepatitis B birth-dose and HBIG should be administered within 24 hours of birth in order to prevent the transmission of hepatitis B from mother to child. It is very important that the shots be given in opposite limbs, to ensure the highest effectiveness. Please see chart above for more information.

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Persons With Inadequate Immunization Records

Evidence of long term protection against HB has only been demonstrated in individuals who have been vaccinated according to a recommended immunization schedule. Independent of their anti-HBs titres, children and adults lacking adequate documentation of immunization should be considered susceptible and started on an immunization schedule appropriate for their age and risk factors. Refer to Immunization of Persons with Inadequate Immunization Records in Part 3 for additional information.

Immunisation Against Hepatitis B For People At Risk

In Victoria free hepatitis B vaccine is provided for people who are at increased risk, including:

  • Men who have sex with men.
  • People living with HIV.
  • People living with hepatitis C.
  • Prisoners.
  • People no longer in a custodial setting who commenced, but did not complete, a free vaccine course while in custody.
  • Aboriginal and Torres Strait Islander people.
  • People born in priority hepatitis B endemic countries who arrived in Australia in the last 10 years priority countries include China, Philippines, Malaysia, Vietnam, Afghanistan, Thailand, South Korea, Myanmar , Indonesia, Singapore, Hong Kong, Taiwan and Cambodia.
  • Vulnerable citizens people who have experienced hardship that prevented them from accessing the vaccine earlier. Vulnerable citizens are vaccinated based on an individual assessment by an immunisation provider.

Immunisation is also recommended, but not free, for people who are at increased risk including:

If you think you have been exposed to hepatitis B, see a doctor immediately. Your doctor can give you treatment that, in some instances, can greatly reduce your risk of infection with hepatitis B.

Remember that being immunised against hepatitis B does not protect you against HIV, hepatitis C or other diseases spread by blood or bodily fluids. It is important that you take precautions to make sure you are not exposed to these diseases.

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Who Should Not Get The Hepatitis B Vaccine

Generally seen as a safe vaccine, there are some circumstances in which doctors advise against receiving the HBV vaccine. You shouldnt have the hepatitis B vaccine if:

  • youve had a serious allergic reaction to a previous dose of the hepatitis B vaccine
  • you have a history of hypersensitivity to yeast or to any other vaccine components
  • youre experiencing a moderate or severe acute illness

If youre currently experiencing an illness, you should postpone receiving the vaccine until your condition has improved.

A Look At Each Vaccine: Hepatitis B Vaccine

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The hepatitis B vaccine is given to prevent the severe liver disease that can develop when children or adults are infected with hepatitis B virus. The hepatitis B vaccine is given as a series of three shots. The first dose is given within 24 hours of birth. The second dose is given one to two months after the first dose, and the third dose is given between 6 months and 18 months of age.

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Which Workers Can Be Vaccinated

The situation in Chile only obliges health personnel in direct contact with patients and laboratories, as well as students of health careers, to receive the Hepatitis B vaccine in the 0-1 and 6-month schedule, due to the high risk of having contact with body fluids, which are responsible for Hepatitis B infection, and the

How Is This Vaccine Given

This vaccine is given as an injection into a muscle. You will receive this injection in a doctor’s office or other clinic setting.

The hepatitis A and B vaccine is given in a series of 3 shots. The booster shots are given 1 month and 6 months after the first shot.

If you have a high risk of hepatitis infection, you may be given 3 shots within 30 days, and a fourth shot 12 months after the first.

Your individual booster schedule may be different from these guidelines. Follow your doctor’s instructions or the schedule recommended by the health department of the state you live in.

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What Are Warnings And Precautions For Hepatitis B Vaccine

Warnings

This medication contains the hepatitis b vaccine. Do not take Engerix B or Recombivax HB if you are allergic to the hepatitis b vaccine or any ingredients contained in this drug.

Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center immediately.

Contraindications

How Does The Hepatitis B Vaccine Series Work

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The vaccine protects you from the hepatitis B virus by getting your body’s immune system to make antibodies. Those antibodies protect you by fighting off the virus if it ever gets into your body.

Usually, the vaccine is spaced out into three different shots called a hepatitis B vaccine schedule. One month after your first shot, you get the second shot. Six months after your first shot, you get the third shot. If you miss your second or third dose, get it as soon as you remember.

The hepatitis vaccine is super effective. Its worked really well to lower the number of people who get hepatitis B every year.

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Persons New To Canada

Health care providers who see persons newly arrived in Canada should review the immunization status and update immunization for these individuals, as necessary. In many countries outside of Canada, HB vaccine is in limited use.

All persons from a country that is endemic for HB should be assessed and vaccinated against HB if not immune and not infected. Individuals born in developing countries are more likely to be carriers of HB, necessitating vaccination of their sexual and household contacts based on review of their serologic test results. HB vaccine is recommended for all household contacts whose families have immigrated to Canada from areas in which there is a high prevalence of HB and who may be exposed to HB carriers through their extended families or when visiting their country of origin.

Children adopted from countries in which there is a high prevalence of HB infection should be screened for HBsAg and, if positive, household or close contacts in the adopting family should be immunized before adoption or as soon as possible thereafter. Adults going to pick-up children from these countries should be vaccinated before departure. Refer to Immunization of Persons New to Canada in Part 3 for additional information.

Transmission Symptoms And Treatment

How is HBV transmitted?

HBV is transmitted through activities that involve percutaneous or mucosal contact with infectious blood or body fluids , including

  • sex with an infected partner
  • injection-drug use that involves sharing needles, syringes, or drug-preparation equipment
  • birth to an infected mother
  • contact with blood from or open sores on an infected person
  • exposures to needle sticks or sharp instruments and
  • sharing certain items with an infected person that can break the skin or mucous membranes , potentially resulting in exposure to blood.

How long does HBV survive outside the body?

HBV can survive outside the body and remains infectious for at least 7 days .

What should be used to clean environmental surfaces potentially contaminated with HBV?

Any blood spills should be disinfected using a 1:10 dilution of one part household bleach to 10 parts of water. Gloves should be worn when cleaning up any blood spills.

Who is at risk for HBV infection?

The following populations are at increased risk for becoming infected with HBV:

  • Infants born to infected mothers
  • Sex partners of infected people
  • Men who have sex with men
  • People who inject drugs
  • Household contacts or sexual partners of known people with chronic HBV infection
  • Health-care and public-safety workers at risk for occupational exposure to blood or blood-contaminated body fluids
  • Hemodialysis patients

Who should be screened for HBV?

CDC recommends that the following people be screened for HBV :

  • fever,

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Guidance On Reporting Adverse Events Following Immunization

Vaccine providers are asked to report, through local public health officials, any serious or unexpected adverse event temporally related to vaccination. An unexpected AEFI is an event that is not listed in available product information but may be due to the immunization, or a change in the frequency of a known AEFI.

Refer to Reporting Adverse Events Following Immunization in Canada and Adverse events following immunization in Part 2 for additional information about AEFI reporting.

Liver Anatomy And Function

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Main Function of the Liver

The liver is an essential organ that has many functions in the body. The liver plays an important role in detoxifying the body by converting ammonia, a byproduct of metabolism in the body, into urea that is excreted in the urine by the kidneys. The liver also breaks down medications and drugs, including alcohol, and is responsible for breaking down insulin and other hormones in the body. The liver also stores vitamins and chemicals that the body requires as building blocks.

Many different disease processes can occur in the liver, including infections such as hepatitis, cirrhosis , cancers, and damage by medications or toxins.

Symptoms of liver disease can include:

  • Jaundice

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Do The Benefits Of The Hepatitis B Vaccine Outweigh Its Risks

Every year in the United States about 2,000 people die following an overwhelming hepatitis B virus infection. In addition, every year about 22,000 people are infected with hepatitis B. Some of them will remain chronically infected, putting them at high risk of the long-term consequences of hepatitis B virus infection: cirrhosis and liver cancer. In fact, with the exception of influenza virus, hepatitis B virus causes more severe disease and death in the United States than any other vaccine-preventable disease. On the other hand, the hepatitis B vaccine is an extremely rare cause of a severe allergic reaction called anaphylaxis. To date, no one has died from this reaction, but it is theoretically possible that this could occur.

Because hepatitis B virus is a common cause of severe disease and death in the United States, and because the hepatitis B vaccine does not cause permanent damage or death, the benefits of the hepatitis B vaccine clearly outweigh its risks.

Facts About Hepatitis B

  • Two billion people, or one in three, have been infected with hepatitis B worldwide. Of these, about 260 million live with chronic hepatitis B.
  • Each year about 900,000 people die from hepatitis B worldwide, and about 2,000 of these deaths occur in the United States.
  • Hepatitis B is transmitted through blood and is 100 times more infectious than HIV. An estimated one billion infectious viruses are in one-fifth of a teaspoon of blood of an infected person, so exposure to even a minute amount, such as on a shared toothbrush can cause infection.
  • Hepatitis B is sometimes referred to as the silent epidemic because most people who are infected do not experience any symptoms.
  • Liver cancer is the fourth leading cause of cancer deaths throughout the world, behind lung, colorectal and stomach cancers.
  • Almost half of liver cancers are caused by chronic infection with hepatitis B.
  • The World Health Organization recommends the inclusion of hepatitis B vaccine in immunization programs of all countries in 2017, about 8 of 10 infants born throughout the world received three doses of hepatitis B vaccine.

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About The Hepatitis B Virus

The hepatitis B virus is a small DNA virus that belongs to the Hepadnaviridae family. Related viruses in this family are also found in woodchucks, ground squirrels, tree squirrels, Peking ducks, and herons.

Structure of the Hepatitis B Virus The hepatitis B virus contains an outer envelope and an inner core.

  • The outer envelope of the virus is composed of a surface protein called the hepatitis B surface antigen or “HBsAg”. The HBsAg can be detected by a simple blood test and a positive test result indicates a person is infected with the hepatitis B virus.
  • The inner core of the virus is a protein shell referred to as the hepatitis B core antigen or “HBcAg,” which contains the hepatitis B virus DNA and enzymes used in viral replication.

Life Cycle of the Hepatitis B Virus

The hepatitis B virus has a complex life cycle. The virus enters the host liver cell and is transported into the nucleus of the liver cell. Once inside the nucleus, the viral DNA is transformed into a covalently closed circular DNA , which serves as a template for viral replication . New HBV virus is packaged and leaves the liver cell, with the stable viral cccDNA remaining in the nucleus where it can integrate into the DNA of the host liver cell, as well as continue to create new hepatitis B virus. Although the life cycle is not completely understood, parts of this replicative process are error prone, which accounts for different genotypes or genetic codes of the hepatitis B virus.

Is It Okay To Get An Extra Dose Of Hepatitis B Vaccine

Why do newborns need the hepatitis B vaccine?

Yes. Although extra doses of vaccine are not recommended, you can think of the extra dose as another chance for the immune system to see the hepatitis B virus. A vaccine is not the only time the immune system will see the virus or bacteria contained in it. People may be exposed to the virus or bacteria at school or the store or when visiting family or friends. An extra dose of vaccine is like one more exposure, except the difference is that the virus or bacteria in any vaccine has been made safe, so it wont make you ill.

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If I Already Have Hepatitis B Can The Vaccine Treat It

No. The hepatitis vaccine prevents hepatitis, but doesnt cure it if you already have it. If you have hepatitis B, there are other treatment options.

However, if you recently got exposed to the hepatitis B virus and you havent had the vaccine yet, tell your doctor right away. The vaccine and possibly other treatment can reduce your chances of getting hepatitis B if you get it within 2 weeks after you came into contact with the virus. The sooner you seek care after being exposed to hepatitis B, the better, so try to get there right away.

What Other Drugs Will Affect Hepatitis A And B Vaccine

Before receiving this vaccine, tell the doctor about all other vaccines you have recently received.

Also tell the doctor if you have recently received drugs or treatments that can weaken the immune system, including:

If you are using any of these medications, you may not be able to receive the vaccine, or may need to wait until the other treatments are finished.

This list is not complete. Other drugs may interact with hepatitis A and B vaccine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.

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