Monday, September 25, 2023

Is A Vaccine Available For Hepatitis B

How To Get Vaccinated Against Hepatitis B

Hepatitis B Vaccine

All babies in the UK born on or after 1 August 2017 are given 3 doses of hepatitis B-containing vaccine as part of the NHS routine vaccination schedule.

These doses are given at 8, 12 and 16 weeks of age.

Babies at high risk of developing hepatitis B infection from infected mothers are given extra doses of the hepatitis B vaccine at birth, 4 weeks and 1 year of age.

If you think you’re at risk and need the hepatitis B vaccine, ask your GP to vaccinate you, or visit any sexual health or genitourinary medicine clinic.

If your job places you at risk of hepatitis B infection, it’s your employer’s responsibility to arrange vaccination for you, rather than your GP. Contact your occupational health department.

Hepatitis B Vaccine: Canadian Immunization Guide

For health professionals

Last partial content update : May 2022

The footnotes in and the accompanying text description for the figure have been revised to align with the corresponding figure in Protocole d’immunisation du Québec, 5e édition from which it was adapted.

Last complete chapter revision :

What Are The Treatment Options For Hepatitis B

Currently, there is no specific antiviral treatment recommended for persons with acute hepatitis B disease as approximately 95% of infected immunocompetent adults recover spontaneously. Specific treatment is available to support people with chronic HBV infection. The main goal of the available care is to maintain comfort, relieve symptoms, and prevent patients from passing the infection to others. However, notably, not all patients with chronic HBV need to be on medication . Patients with active signs of liver disease may benefit the most from current treatment. The Food and Drug Administration has approved for the treatment of chronic hepatitis B interferon- and oral antiviral agents . Present treatment for chronic hepatitis B can slow or prevent the progression of cirrhosis, reduce the incidence of liver cancer, and improve long term survival and quality of life, but are not curative. Therefore, most people who start hepatitis B treatment must continue for life. The side effects of the therapies and required regular monitoring increases the difficulty and complexity of patient management. Hence, hepatitis B vaccination is plan A in the fight against hepatitis B. Vaccination is, compared to other interventions, an economically attractive option, both in terms of cost-effectiveness and benefit-cost ratios .

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Facts About Hepatitis B

  • Two billion people, or one in three, have been infected with hepatitis B worldwide. Of these, almost 300 million live with chronic hepatitis B. This means about 1 of every 26 people throughout the world are living with a chronic hepatitis B infection.
  • 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 very small 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 accounted for about 5% of cancer deaths in the U.S. during 2020.
  • 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 2019, more than 8 of 10 infants born throughout the world received three doses of hepatitis B vaccine.

Detection Of Antiviral Resistance

Hepatitis B vaccine reintroduced

National and international surveillance is performed by the CDC to determine effectiveness of the current FDA-approved antiviral flu drugs. Public health officials use this information to make current recommendations about the use of flu antiviral medications. further recommends in-depth epidemiological investigations to control potential transmission of the resistant virus and prevent future progression. As novel treatments and detection techniques to antiviral resistance are enhanced so can the establishment of strategies to combat the inevitable emergence of antiviral resistance.

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International Hepatitis B Vaccine Schedules

*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.

The hepatitis B vaccine is an injection that is generally given in the arm and as a three-dose series. The World Health Organization recommends a 0, 1, and 6-month vaccine schedule, though schedules may vary based on a countrys national immunization program. Completing the hepatitis B vaccine series, preferably beginning at birth, will ensure protection against hepatitis B, hepatitis delta and lower the lifetime risk of liver cancer. Greater than 90% of babies and up to 50% of young children who are not vaccinated and are infected with hepatitis B will have lifelong infection, which makes the birth dose essential to their protection. Please note that the vaccine brand name, manufacturer and associated schedules for adults, children and infants may be unique to different countries, though there is a list of WHO prequalified vaccines.

3-Dose Vaccine Series for Infants

The World Health Organization recommends all infants receive the first dose of the hepatitis B vaccine within 24 hours of birth and to complete the vaccine series with additional shots at 1 month and 6 months of age. Beginning the hepatitis B vaccine at birth will ensure protection against hepatitis B for life.

3-Dose Vaccine Series for Children and Adults

4-Dose Combination Vaccine Series for Infants

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Immunisation Against Hepatitis B For Children

Vaccination is the best protection against hepatitis B infection and is recommended for all infants and young children, adolescents and those in high-risk groups. Vaccination can be with a vaccine against hepatitis B alone or with a combination vaccine.

Protection against hepatitis B is available free of charge under the National Immunisation Program Schedule.

In Victoria, vaccination against hepatitis B is free for all babies and children including:

  • Babies at birth vaccinate with hepatitis B vaccine as soon as possible after birth.
  • Babies at 2, 4 and 6 months immunisation in the form of a diphtheria, tetanus, whooping cough, hepatitis B, polio and Haemophilus influenzae type b vaccine .
  • Premature babies at 12 months premature babies born under 32 weeks gestation or under 2,000g birth weight receive a single booster dose.
  • Children up to and including 20 years of age.

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Liver Anatomy And Function

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

What Are Warnings And Precautions For Hepatitis B Vaccine

Viral Hepatitis: Hepatitis A, Hepatitis B, Hepatitis C, HBsAg HBeAg Vaccine HCV HBV HBsAb

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

  • See “What Are Side Effects Associated with Using Hepatitis B Vaccine?”

Long-Term Effects

  • See “What Are Side Effects Associated with Using Hepatitis B Vaccine?”

Cautions

  • Not protective against hepatitis A, C, or E
  • Gluteal muscle injection is not recommended
  • Heptavax B is no longer used in the US

Pregnancy and Lactation

  • Use the hepatitis B vaccine during pregnancy with caution if the benefits outweigh the risks. Animal studies show risk and human studies are not available, or neither animal nor human studies were done.
  • It is not known if the hepatitis B vaccine is excreted in breast milk. Consult your doctor before breastfeeding.

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Safety Of Hepatitis Vaccines

Hepatitis vaccines have been given to millions of people all across the world without any evidence of serious side effects. “They’re very safe, and they’re extremely effective,” says Poland.

If you are not sure whether you should have hepatitis vaccines, talk with your doctor about your specific concerns.

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Are Hepatitis B Virus Infections Easily Avoided

Large quantities of hepatitis B virus are present in the blood of people with hepatitis B in fact, as many as one billion infectious viruses can be found in a milliliter of blood from an infected individual. Therefore, hepatitis B virus is transmitted in the blood of infected individuals during activities that could result in exposure to blood, such as intravenous drug use, tattooing, or sex with people who are infected. However, it is also possible to catch hepatitis B virus through more casual contact, such as sharing washcloths, toothbrushes or razors. In each of these cases, unseen amounts of blood can contain enough viral particles to cause infection. In addition, because many people who are infected don’t know that they are infected, it is very hard to avoid the chance of getting infected with hepatitis B virus.

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How Do You Catch Hepatitis B Virus

Blood from a person infected with hepatitis B virus is heavily contaminated with the virus. As a result, contact with blood is the most likely way to catch hepatitis B. Even casual contact with the blood of someone who is infected can cause infection.

Healthcare workers are at high risk of catching the disease, as are intravenous drug users and newborns of mothers infected with the virus. Sexual contact can also expose people to infection. The virus is also present in low levels in saliva.

Accelerated Us Children And Adult Hepatitis B Vaccine Schedules

Who Really Needs the Hepatitis B Vaccine?
*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.

In some instances, it may be necessary to vaccinate within a short period of time to ensure protection before travel. There are accelerated schedules to provide the highest level of protection over a short period of time. Individuals who need an accelerated schedule must have a booster dose at 1 year to ensure long-term protection. Note that the 2-dose Heplisav-B vaccine will also ensure maximum protection over a 1-month period without the need for a booster dose at 1 year.

4-Dose Vaccine Series for Children and Adults

Engerix-B is a 3-dose vaccine that can be given on an accelerated, four-dose schedule, with 3 shots administered within 2 months, and a booster dose at 1 year to provide maximum long-term protection.

4-Dose Combination Hepatitis A and B Vaccine Series

Twinrix is a 4-dose vaccine that can be given on an accelerated schedule to provide protection against hepatitis A and B. Three doses are administered within 1 month, followed by a booster shot at 1 year. This is a common choice of vaccine for those travelling on short-notice outside the U.S. It is important to complete the booster dose at 1 year, to ensure long-term protection.

2-Dose Vaccine Series

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History And Development Of The First Anticancer Vaccine

The first hepatitis B vaccines, commercially available since 1982, were plasma-derived vaccines. The American microbiologist Maurice Hilleman produced these vaccines by harvesting subvirion particles of HBsAg from the plasma of asymptomatic chronic HBV-infected donors . The particles in the pooled plasma were highly purified and any residual infectious particles were inactivated by various combinations of urea, pepsin, formaldehyde, and heat . Plasma-derived vaccines have been investigated with success in several hundred million individuals, leading to the first licensed hepatitis B vaccines. This first HBV vaccines were manufactured under the name Heptavax B and Hevac B and targeted a number of high-risk groups, the main focus of the immunization program at that time. Although concerns about the safety of these vaccines regarding transmission of bloodborne pathogens, including human immunodeficiency virus , have proven to be unfounded, public anxieties over the safety of the plasma-derived vaccine persisted and hampered its acceptance in many populations . Other barriers for high coverage included high vaccine costs and the lack of global vaccine policies .

Infants Born To Mothers Who Have Hepatitis B: Hepatitis B Vaccine Schedules

*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.

Protecting Your Baby

Infants born to women with hepatitis B must receive accurate doses of hepatitis B vaccine and hepatitis B immune globulin to ensure complete protection. In order to protect these infants, medications should be given immediately after birth in the delivery room or within the first 12-24 hours of life*.

* See Testing and Treatment During Pregnancy section for details. Please note that testing of all pregnant women for hepatitis B is a global recommendation.

3-Dose Vaccine Series for Infants

The World Health Organization recommends that infants born to hepatitis B positive mothers receive the first dose of the hepatitis B vaccine within 24 hours of birth, and ideally a dose of hepatitis B immunoglobulin . These shots must be followed by the additional vaccine doses given on the recommended schedule. In the U.S., infants should follow a 1 month and 6-month schedule for the additional two doses.

4-Dose Combination Vaccine Series for Infants

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The Nonresponder Situation As A Challenge

New vaccine formulations have been and are being developed to meet the challenges of nonresponse or low response among older adults and immunocompromised individuals to current hepatitis B vaccines, for example, third-generation hepatitis B recombinant vaccines containing HBsAg, preS1, and pre-S2 antigens or adjuvanted hepatitis B recombinant vaccines . These vaccines are showing improved immune response in immunocompromised populations and older adults and, in addition, these new vaccines can offer the possibility of simplified schedules, which might be very promising for the future, for example, a 0, 1-month schedule instead of the traditional 0, 1, 6-month schedule .

How Is The Hepatitis B Vaccine Made

Canada-wide Hep A and Hep B vaccine shortage

People are protected against hepatitis B virus infection by making an immune response to a protein that sits on the surface of the virus. When hepatitis B virus grows in the liver, an excess amount of this surface protein is made. The hepatitis B vaccine is made by taking the part of the virus that makes surface protein and putting it into yeast cells. The yeast cells then produce many copies of the protein that are subsequently used to make the vaccine. When the surface protein is given to children in the vaccine, their immune systems make an immune response that provides protection against infection with the hepatitis B virus.

The first hepatitis B vaccine was made in the 1980s by taking blood from people infected with hepatitis B virus and separating or purifying the surface protein from the infectious virus. Because blood was used, there was a risk of contaminating the vaccine with other viruses that might be found in blood, such as HIV. Although contamination with HIV was a theoretical risk of the early, blood-derived hepatitis B vaccine, no one ever got HIV from the hepatitis B vaccine. That is because the blood used to make vaccine was submitted to a series of chemical treatments that inactivated any possible contaminating viruses. Today, there is no risk of contaminating the vaccine with other viruses because the surface protein is manufactured in the laboratory.

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Is There A Hepatitis C Vaccine

No vaccine exists for hepatitis C right now. While efforts to develop a vaccine for this specific strain are ongoing, it’s proven challenging. That’s because hepatitis C tends to avoid immune responses. In other words, a person can catch hepatitis C repeatedly despite past infection, which is what makes it hard to create a vaccine that works for this virus.

There is an effective treatment for hepatitis C, though, and it involves direct-acting antivirals . Thanks to this treatment, WHO aims to cut 80% of hepatitis C cases worldwide by 2030. Researchers across the globe think that a vaccine is needed to accomplish this goal, so creating one is a high priority.

European Commission And Thervacb Join Forces

The role of viral hepatitis as a public health threat has long been underestimated. Only very recently, the United Nations in their 2030 Agenda for Sustainable Development called for international action to combat viral hepatitis and reduce the disease burden. The major killer is the hepatitis B virus causing liver cirrhosis and liver cancer. Worldwide 880,000 humans die each year from the consequences of an HBV infection.

A prophylactic vaccine is available to prevent HBV infection, but more than 3% of the worlds population are chronically infected and do not profit from that vaccine anymore. For those suffering from chronic hepatitis B, until today no curative treatment option exists.

The European Commission therefore selected the project TherVacB led by Helmholtz Zentrum München for a five-year funding within the Horizon 2020 program. A consortium of leading virologists, immunologists and physicians specialized in treating viral hepatitis, will use a newly designed therapeutic vaccine, TherVacB, as an immunotherapy to cure HBV. TherVacB will be evaluated in a three-year clinical trial starting in 2022 conducted in Europe and in Africa. Integration of a partner site in Tanzania shall help building local capacities for diagnosing and treating hepatitis B and support an important goal of the consortium to raise awareness for hepatitis B.

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