Trevor James
Hepatitis A and Hepatitis B are two distinct diseases that affect the liver. Hepatitis A is usually a short-term illness that clears up on its own, while Hepatitis B can become chronic and lead to severe health issues such as liver damage or cancer. Fortunately, both Hepatitis A and B are vaccine-preventable, and there are safe and effective vaccines available to protect against them. These vaccines work by causing the body to produce antibodies, which offer protection against the diseases. The Hepatitis A vaccine is recommended for international travellers, and the Hepatitis B vaccine is advised for all newborns and those at high risk of infection. There is also a combination vaccine that protects against both hepatitis A and B, which is suggested for adults over 18 who are at risk of infection.
| Characteristics | Values |
|---|---|
| Vaccines | Hepatitis A, Hepatitis B, Hepatitis A & B Combination |
| Protection Against | Hepatitis A, Hepatitis B |
| Who Should Get Vaccinated? | Infants, Children, Adults |
| Risk Factors | International Travel, Men who have sex with men, People who use drugs, Experiencing homelessness, Individuals with HIV or chronic liver disease, Job-related risk, Sexual activity, Contact with blood or blood-contaminated body fluids, Mothers with Hepatitis B, Newborns, Adults with diabetes, Adults over 60 |
| Number of Doses | Hepatitis A: 2-3 doses; Hepatitis B: 3-4 doses; Hepatitis A & B Combination: 2 doses |
| Dose Interval | 6 months apart for Hepatitis A; 1 month apart for Hepatitis B; 2-4 months apart for Hepatitis B |
| Side Effects | Fainting, Soreness at the injection site |
| Precautions | Allergic reactions, Severe allergies, Severe illness |
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What You'll Learn
Hepatitis A and B vaccine side effects and uses
Hepatitis A and hepatitis B are both serious liver diseases that can cause death. Hepatitis A is most often spread through infected food or water, or close contact with an infected person. Hepatitis B is spread by contact with bodily fluids, such as blood, saliva, semen, or vaginal fluids, as well as from mother to child.
There are safe and effective vaccines for hepatitis A and hepatitis B, as well as a combination vaccine that protects against both viruses. The CDC recommends that all infants receive their first dose of the hepatitis B vaccine at birth, and the hepatitis A vaccine between 12 and 23 months. Children older than 2 can receive their first dose at their next doctor's visit. The combination vaccine is recommended for anyone 18 years or older who is at risk of infection due to their job, certain behaviours, or travel to certain parts of the world.
People who are at increased risk of hepatitis B include those with haemophilia, chronic liver disease, or exposure to blood in the workplace, injection drug use, or certain medical conditions. People at increased risk of hepatitis A include international travellers, men who have sex with men, people who use or inject drugs, people who anticipate close contact with an international adoptee, and people experiencing homelessness.
The hepatitis A and B combination vaccine works by causing the body to produce its own antibodies against the disease. It is important to complete the full dosing schedule for the best protection against infection. A booster dose is given at least 12 months after the first dose.
As with any medicine, there is a small risk of side effects or a serious problem occurring after vaccination. However, the potential risks of hepatitis A and B are much higher than any risks associated with the vaccines. Side effects may include soreness, redness, or swelling in the arm where the shot was given, irritability, diarrhoea, loss of appetite, vomiting, crying, and drowsiness. Fainting may also occur after receiving the vaccine. Severe allergic reactions are rare but can be life-threatening. Symptoms of a severe allergic reaction include hives, swelling of the face and throat, difficulty breathing, a fast heartbeat, dizziness, and weakness.
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Who should get the hepatitis A and B vaccines?
Hepatitis A and B are serious liver diseases that can cause death. Hepatitis A is usually ingested via contaminated food or water and is endemic to countries with insufficient sanitation systems. Hepatitis B is spread by contact with body fluids, such as blood, semen, or vaginal fluids. Vaccines are available to prevent infection caused by all known subtypes of hepatitis A and hepatitis B. Here are the groups of people who should get the hepatitis A and/or B vaccines:
Hepatitis A Vaccine
- International travellers: If you are planning to travel internationally, talk to your doctor about getting vaccinated against hepatitis A. This is especially important if you are travelling to an area where hepatitis A is common or where medical resources are limited.
- Children: The hepatitis A vaccine is recommended for children over the age of 12 months who are travelling internationally.
- People at risk of infection: This includes people who work with HAV-infected primates or are involved in research handling the hepatitis A virus, people who are homeless or living in temporary housing, and people adopting or close to a child adopted from a country where hepatitis A is common.
Hepatitis B Vaccine
- Infants and Children: The CDC and NHS recommend that all infants receive their first dose of the hepatitis B vaccine at birth. Children should receive their first dose between 12 and 23 months of age. Catch-up vaccinations are recommended for children and teens who were never vaccinated or did not receive all the required doses.
- Pregnant or Breastfeeding Individuals: Vaccination is recommended for pregnant or breastfeeding individuals who are at risk of getting hepatitis A or B.
- People at Risk of Infection: This includes people whose jobs routinely put them at risk of coming into contact with blood or blood-contaminated body fluids, such as healthcare workers, people who are sexually active and are not in a monogamous long-term relationship, and military personnel.
- People with Certain Medical Conditions: Individuals with hemophilia, chronic liver disease, or kidney failure may require the hepatitis B vaccine.
- International travellers: If you are travelling to an area where hepatitis B is common, you should consider getting the hepatitis B vaccine.
Hepatitis A and B Combination Vaccine
The hepatitis A and B combination vaccine is recommended for individuals aged 18 years or older who are at risk of infection from their jobs, certain behaviours, or travel to certain parts of the world. This includes Central and South America, Eastern and Southern Europe, South and Southeast Asia (except Japan), the Caribbean, and the Middle East.
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How many doses of the hepatitis A and B vaccines are required?
The number of doses of the hepatitis A and B vaccines required depends on the type of vaccine and the age of the recipient.
Hepatitis A Vaccine
The hepatitis A vaccine is generally administered as two doses over a 6-month period. This includes single-antigen vaccines like Havrix and Vaqta, which are licensed for use in individuals 12 months and older. The Advisory Committee on Immunization Practices (ACIP) recommends routine vaccination for children ages 12-23 months and catch-up vaccination for children ages 2-18 years who have not previously received the hepatitis A vaccine. Unvaccinated adults who are at increased risk of infection or severe disease are also advised to get vaccinated.
Hepatitis B Vaccine
The hepatitis B vaccine is typically given as a three-dose series on a 0, 1, and 6-month schedule. This includes vaccines like Twinrix, which is recommended for children and infants. The World Health Organization (WHO) and the CDC suggest that newborns receive their first dose of the hepatitis B vaccine within 24 hours of birth to ensure lifelong protection.
Hepatitis A and B Combination Vaccine
The combination vaccine for hepatitis A and B, such as Twinrix, is recommended for adults aged 18 and older. It can be administered as a three-dose series over six months or an accelerated schedule of four doses, with three doses given within one month and a booster at one year. This accelerated schedule is often chosen by travellers who are departing at short notice.
It is important to note that the number of doses and the schedule may vary based on individual factors and country-specific guidelines. It is always advisable to consult with a healthcare professional to determine the appropriate vaccination regimen.
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How effective are the hepatitis A and B vaccines?
Hepatitis A and B vaccines are safe and highly effective. Vaccination is the best way to protect against hepatitis A, and there are also separate vaccines for hepatitis B. There is also a combination vaccine that protects against both hepatitis A and hepatitis B. The hepatitis B vaccine is also known as the first "anti-cancer" vaccine because it prevents hepatitis B, the leading cause of liver cancer worldwide.
The hepatitis A vaccine has been in use since 1995, and millions of doses have been administered since then. It is recommended for all children between the ages of 12 months and 23 months as part of routine childhood vaccination. Children and adolescents between the ages of 2 and 18 who have not previously received the vaccine should also get vaccinated. Additionally, people who are at higher risk for hepatitis A, such as international travellers, men who have sex with men, people who use or inject drugs, and those who anticipate close contact with an international adoptee, should prioritise getting vaccinated.
The hepatitis B vaccine is also considered one of the safest and most effective vaccines ever made, with more than 1 billion doses administered worldwide. It is recommended for all newborns, children up to 18 years of age, and adults at higher risk for infection. The CDC recommends that all infants receive their first dose of the hepatitis B vaccine at birth. Children should get the second dose at least one month after the first, and the third dose at least four months after the first and two months after the second. For complete protection, children should receive two doses six months apart.
The combination hepatitis A and B vaccine is recommended for individuals 18 years of age or older who are at risk of infection due to their jobs, behaviours, or travel to certain regions. This includes people living in or travelling to areas with a high rate of hepatitis A infection and a high risk of hepatitis B infection.
While the vaccines are highly effective, it is important to note that there is a small risk of serious problems associated with any medicine, including vaccines. However, the potential risks of hepatitis A and B are much higher than any risks associated with the vaccines.
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How do the hepatitis A and B vaccines work?
Hepatitis A is a serious disease of the liver that can cause death. It is caused by the hepatitis A virus (HAV) and is spread most often through infected food or water. Hepatitis A can also be spread by close person-to-person contact with infected persons, even if they do not appear to be sick. Hepatitis B, on the other hand, is caused by the hepatitis B virus (HBV) and is spread by contact with body fluids, such as blood, saliva, semen, or vaginal fluids. It can also be spread by needle sticks, sharing needles, or from mother to child.
There are separate vaccines for hepatitis A and hepatitis B, as well as a combination vaccine that protects against both viruses. The hepatitis A vaccine is the best way to prevent infection, and it is recommended for people who are planning to travel internationally or who are at high risk of infection due to their jobs or behaviours. The CDC also recommends that all infants get their first dose of the hepatitis B vaccine at birth.
The combination vaccine is recommended for people who are 18 years or older and who are at risk of infection from their jobs, certain behaviours, or travel to certain parts of the world. The vaccine works by causing the body to produce its own protection (antibodies) against the disease. For long-lasting immunity, you need two, three, or four doses, depending on the type of vaccine used. It is important to note that the vaccine may not protect everyone who receives it, and it will not treat symptoms of hepatitis A or hepatitis B infection if you already have the disease.
Both types of hepatitis A vaccine are safe and highly effective, even for people with compromised immune systems. However, as with any medicine, there is a small risk of serious problems occurring after vaccination. It is important to consult with a doctor before getting vaccinated to weigh the risks and benefits and ensure that the vaccine is appropriate for your individual situation.
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Frequently asked questions
The Hepatitis A vaccine protects against the Hepatitis A virus (HAV), which is spread through infected food or water, or close contact with infected persons.
The Hepatitis B vaccine protects against the Hepatitis B virus (HBV), which is spread by contact with bodily fluids, such as blood, saliva, semen, or vaginal fluids.
The CDC recommends that all children between the ages of 12 and 23 months get the Hepatitis A vaccine, as well as infants aged 6 to 11 months who are travelling internationally. It is also recommended for people who are travelling to certain countries, people who work with HAV-infected primates, people who are homeless or living in temporary housing, and people adopting or close to a child adopted from a country where Hepatitis A is common.
The CDC recommends that all infants get their first dose of the Hepatitis B vaccine at birth. It is also recommended for children up to 18 years of age, adults at high risk for infection, and adults living with diabetes.
Yes, there is a combination vaccine that protects against both Hepatitis A and B. This vaccine is recommended for all persons 18 years of age or older who are at risk of infection from their jobs, certain behaviours, or travel to certain parts of the world.
