Sarah Bennett
Hepatitis A is a vaccine-preventable disease. Vaccination is the best way to protect against the hepatitis A virus (HAV). The hepatitis A vaccine is safe, highly effective, and provides long-term protection. It is recommended for children as part of their routine vaccinations, but adults with an increased risk of HAV infection may also need the vaccine. The vaccine is especially important for international travelers, as hepatitis A is more common in certain countries and regions. While the exact duration of protection is unknown, studies suggest that the vaccine may offer protection for at least 20 years, with some research indicating the possibility of lifetime protection.
| Characteristics | Values |
|---|---|
| Effectiveness | Hepatitis A vaccines are safe, highly effective, and provide long-term protection. |
| Duration of Protection | The exact duration of protection is unknown, but studies have shown that anti-HAV can persist for at least 20 years, with some sources suggesting up to 25 years for adults and 14-20 years for children. A 2020 review suggests that two doses may provide lifetime protection. |
| Vaccination Schedule | The vaccination is typically administered in two doses for children and adults, with the second dose administered 6-12 months after the first dose. For children, the first dose is recommended at 12-23 months old, and the second dose at 2-4 years old. |
| Accelerated Schedule | In cases of potential exposure, such as travel, the vaccination can be administered on an accelerated schedule with three doses over 30 days, followed by a booster dose at 12 months. |
| Contraindications | People with a history of severe allergic reaction to the hepatitis A vaccine or its components should not receive the vaccination. Those who are currently moderately or severely ill should wait until they recover before getting vaccinated. |
| At-Risk Groups | At-risk groups include international travelers, men who have sex with men, people who use or inject drugs, people with chronic liver disease or HIV, pregnant people, and those in outbreak areas. |
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What You'll Learn
Hepatitis A vaccine effectiveness
Hepatitis A vaccines are safe and highly effective in preventing HAV infection. The Advisory Committee on Immunization Practices (ACIP) recommends routine vaccination for children between 12-23 months old and catch-up vaccination for children between 2-18 years old who have not previously received the vaccine. Unvaccinated adults at increased risk of infection or severe disease from infection are also advised to get vaccinated.
The hepatitis A vaccine is an inactivated vaccine, meaning it contains a killed version of the hepatitis A virus. The United States Food and Drug Administration (FDA) has licensed two single-antigen hepatitis A vaccines (Havrix and Vaqta) and one combination vaccine for protection against hepatitis A and B (Twinrix). The vaccine schedule varies slightly depending on the vaccine brand and the recipient's age. For instance, children can receive their first vaccine at 12 months old or older, while adults typically require two doses of the vaccine, with the second dose administered 6-18 months after the first, depending on the brand.
While the exact duration of protection provided by the hepatitis A vaccine is unknown, studies suggest that it offers long-term protection, and possibly even lifelong immunity. Research indicates that protection may persist for at least 20 years in those who receive the full vaccine series, with some sources estimating protection for up to 30-40 years or more.
Vaccination is particularly important for individuals at higher risk of hepatitis A infection, including international travelers, men who have sex with men, people with certain medical or lifestyle risk factors, and those who are unable to get vaccinated or are at higher risk for disease. Good hygiene practices, such as frequent handwashing and safe food and water consumption, also play a crucial role in preventing the spread of hepatitis A.
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Hepatitis A vaccine safety
Hepatitis A is a highly contagious liver infection caused by the hepatitis A virus. It can range from a mild illness lasting a few weeks to a severe illness lasting several months and can even cause death in rare cases. The best way to prevent infection is to get vaccinated.
Hepatitis A vaccines are safe and highly effective at preventing hepatitis A infections. The vaccines are inactivated, meaning they contain a killed version of the hepatitis A virus. Since the vaccine was first recommended, cases of hepatitis A have declined significantly. The two types of hepatitis A vaccines are single-antigen and combination. The single-antigen vaccine protects against hepatitis A, while the combination vaccine protects against both hepatitis A and hepatitis B. The combination vaccine is only available for people aged 18 and older.
The hepatitis A vaccine has been licensed in the United States since 1995, and approximately 50 million doses were distributed between 1995 and 2005. The Vaccine Adverse Event Reporting System (VAERS) received 6,136 reports of adverse events during this time among people who received the hepatitis A vaccine. The most common adverse events reported were fever, injection site reactions, rash, and headache. However, a review of these reports could not determine a causal relationship between the vaccine and the reported events.
The Advisory Committee on Immunization Practices (ACIP) recommends routine vaccination for children aged 12-23 months and catch-up vaccination for children aged 2-18 years who have not previously received the vaccine. Unvaccinated adults at increased risk of infection or severe disease from infection should also be vaccinated. People with minor illnesses, such as a cold, can receive the vaccine, but those who are moderately or severely ill should wait until they recover.
While the hepatitis A vaccine is generally safe and effective, as with any medicine, there is a small risk of side effects or other adverse events. However, the potential risks of hepatitis A infection are much higher than any risks associated with the vaccine.
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Hepatitis A vaccine schedule
The hepatitis A vaccine is highly effective in preventing hepatitis A virus (HAV) infection and is recommended for all children as part of their routine vaccinations. The Advisory Committee on Immunization Practices (ACIP) recommends routine vaccination for children between 12 and 23 months, with a catch-up vaccination for children between 2 and 18 years who have not previously received the vaccine. The hepatitis A vaccine series is typically administered over the course of 6 months, with two doses given 6 to 12 months apart for children and 6 to 18 months apart for adults, depending on the vaccine brand.
For infants who are travelling outside the United States and require protection against HAV infection, a single travel dose can be administered between 6 and 11 months of age. However, this does not form part of the routine hepatitis A vaccination schedule, which should be started from the age of 1 year onward. The second dose should be administered at 2 to 4 years of age to complete the routine vaccination series.
Unvaccinated children and adolescents between 12 months and 18 years of age should receive two doses of the hepatitis A vaccine, with a minimum interval of 6 months between doses. Adolescents aged 18 years and older may receive the HepA-HepB (Twinrix) combination vaccine as either a 3-dose or 4-dose series. The 3-dose series is administered at 0, 1, and 6 months, while the 4-dose series consists of 3 doses at 0, 7, and 21-30 days, followed by a booster dose at 12 months.
For adults aged 19 and older, two doses of the hepatitis A vaccine are recommended. The second dose should be administered 6 to 12 months after the first dose, depending on the vaccine brand. It is important to note that the exact duration of protection provided by the hepatitis A vaccine is unknown, but it is estimated to last for at least 20 years, with some research suggesting it may offer lifelong protection.
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Hepatitis A vaccine recommendations for travellers
Hepatitis A vaccines are safe and highly effective in preventing HAV infection. The Advisory Committee on Immunization Practices (ACIP) recommends routine hepatitis A vaccination for all children and unvaccinated adults who are at increased risk of infection or severe disease from infection. This includes international travellers, especially those travelling to or working in countries with high or intermediate HAV endemicity.
The exact duration of protection offered by the hepatitis A vaccine is unknown, but it does provide long-term protection. Research suggests that protection may last at least 20 years in people who receive the full vaccine series. The immunoglobulin G (IgG) anti-HAV produced after vaccination confers long-term immunity, and some sources suggest that the vaccine may even offer lifetime protection.
In the United States, the two single-antigen hepatitis A vaccines licensed for use are Havrix and Vaqta, and the combination hepatitis A and hepatitis B vaccine is Twinrix. Havrix and Vaqta are approved for people aged 12 months and older, while Twinrix is approved for adults aged 18 and older. Children need two doses of the vaccine as part of their routine vaccinations, with the first dose administered at 12–23 months old and the second dose at 2–4 years old. Adults also require two doses, with the second dose administered 6–12 months after the first dose.
For travellers, it is recommended that the first dose of the hepatitis A vaccine be administered as soon as travel is planned, and the second dose be administered according to the vaccination schedule. If travel is planned in less than two weeks, IG (0.1 mL/kg) can be administered in addition to the vaccine. Infants aged 6–11 months travelling outside the United States can receive one travel dose of the hepatitis A vaccine, although doses administered before 12 months of age may result in a suboptimal immune response.
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Hepatitis A vaccine side effects
The hepatitis A vaccine is generally considered safe and highly effective in preventing hepatitis A infections. It is an inactivated vaccine, meaning it contains a killed version of the hepatitis A virus. This vaccine is administered as two doses, with the second dose given 6-18 months after the first, depending on the specific vaccine formulation.
While the vaccine is safe for most people, as with any medicine, there is a small risk of side effects. These side effects are usually mild and last for only 1-2 days. The most commonly reported side effects in both adults and children include soreness, tenderness, pain, and warmth at the injection site. Other potential side effects include headache, loss of appetite, and fatigue. In children aged 11-25 months, additional side effects such as irritability and drowsiness have been observed.
It is important to note that the hepatitis A vaccine should not be administered to individuals with a history of severe allergic reactions to the vaccine or its components. Individuals with allergies to neomycin should also refrain from taking the vaccine. Those with bleeding disorders like hemophilia should use it with caution due to the potential for increased bleeding at the injection site.
The Vaccine Adverse Event Reporting System (VAERS) is a monitoring system co-managed by the CDC and FDA that collects reports of adverse events following vaccination. Between 1995 and 2005, VAERS received 6,136 reports of adverse events associated with the hepatitis A vaccine, with the most common being fever, injection site reactions, rash, and headache. However, the review of these reports could not establish a direct causal relationship between the vaccine and the reported events.
Overall, the hepatitis A vaccine is considered safe, and the benefits of protection against the potentially deadly hepatitis A virus typically outweigh the risks of mild and short-lived side effects.
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Frequently asked questions
It is unclear exactly how long the Hep A vaccine works, but it does provide long-term protection. Research suggests that protection may last at least 20 years, with some sources claiming it could be up to 30-40 years or even provide lifetime protection.
The Hep A vaccine is recommended for children as part of their routine vaccinations. The CDC also recommends the vaccine for unvaccinated adults who are at increased risk of infection or severe disease. This includes international travellers, men who have sex with men, people who use or inject drugs, and pregnant people.
You should get the Hep A vaccine as early as possible before travelling. If you are unable to get the vaccine, your doctor might recommend immune globulin to protect you for up to 2 months.
The most frequently reported adverse events associated with the Hep A vaccine are fever, injection site reactions, and rash. As with any medicine, there is a small risk of a serious problem occurring after vaccination, but the potential risks of Hep A are much higher.
You may be able to get the Hep A vaccine at a pharmacy, doctor's office, travel clinic, or health centre. The vaccine may be free or low cost, and your insurance may cover it.
