HBsAg | Total anti-HBc | IgM anti-HBc | Anti-HBs | HBV DNA | Interpretation |
---|---|---|---|---|---|
– | – | – | – | – | Never infected |
+ | – | – | – | + or – | Early acute infection; transient (up to 18 days) after vaccination |
+ | + | + | – | + | Acute infection |
– | + | + | + or – | + or – | Acute resolving infection |
– | + | – | + | – | Recovered from past infection and immune |
+ | + | – | – | + | Chronic infection |
– | + | – | – | + or – | False-positive (i.e., susceptible); past infection; “low-level” chronic infection; or passive transfer of anti-HBc to infant born to HBsAg-positive mother |
– | – | – | + | – | Immune if anti-HBs concentration is ≥10 mIU/mL after vaccine series completion; passive transfer after hepatitis B immune globulin administration |
Table 1. Typical interpretation of test results for hepatitis B virus infection
Abbreviations: – = negative; + = positive; anti-HBc = antibody to hepatitis B core antigen; anti-HBs = antibody to hepatitis B surface antigen; HBsAg = hepatitis B surface antigen; HBV DNA = hepatitis B virus deoxyribonucleic acid; IgM = immunoglobulin class M.
Age group (yrs) | Single-antigen vaccine | Combination vaccine | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Recombivax | Engerix | Pediarix* | Twinrix† | |||||||
Dose (µg) | Vol (mL) | Dose (µg) | Vol (mL) | Dose (µg) | Vol (mL) | Dose (µg) | Vol (mL) | |||
Birth–10 | 5 | 0.5 | 10 | 0.5 | 10* | 0.5 | N/A | N/A | ||
11–15 | 10§ | 1 | N/A | N/A | N/A | N/A | N/A | N/A | ||
11–19 | 5 | 0.5 | 10 | 0.5 | N/A | N/A | N/A | N/A | ||
≥20 | 10 | 1 | 20 | 1 | N/A | N/A | 20† | 1 | ||
Hemodialysis patients and other immune-compromised persons | ||||||||||
<20 | 5 | 0.5 | 10 | 0.5 | N/A | N/A | N/A | N/A | ||
≥20 | 40 | 1 | 40 | 2 | N/A | N/A | N/A | N/A |
Table 2. Recommended doses of hepatitis B vaccine, by group and vaccine type
Abbreviation: N/A = not applicable.
* Pediarix is approved for use in persons aged 6 weeks through 6 years (prior to the 7th birthday).
† Twinrix is approved for use in persons aged ≥18 years.
§ Adult formulation administered on a 2-dose schedule.
Birthweight | Maternal HBsAg status | Single-antigen vaccine | Single-antigen + combination vaccine | ||
---|---|---|---|---|---|
Dose | Age | Dose | Age | ||
≥2,000 g | Positive | 1 | Birth (≤12 hrs) | 1 | Birth (≤12 hrs) |
HBIG§ | Birth (≤12 hrs) | HBIG | Birth (≤12 hrs) | ||
2 | 1–2 mos | 2 | 2 mos | ||
3 | 6 mos¶ | 3 | 4 mos | ||
4 | 6 mos¶ | ||||
Unknown* | 1 | Birth (≤12 hrs) | 1 | Birth (≤12 hrs) | |
2 | 1–2 mos | 2 | 2 mos | ||
3 | 6 mos¶ | 3 | 4 mos | ||
4 | 6 mos¶ | ||||
Negative | 1 | Birth (≤24 hrs) | 1 | Birth (≤24 hrs) | |
2 | 1–2 mos | 2 | 2 mos | ||
3 | 6–18 mos¶ | 3 | 4 mos | ||
4 | 6 mos¶ | ||||
<2,000 g | Positive | 1 | Birth (≤12 hrs) | 1 | Birth (≤12 hrs) |
HBIG | Birth (≤12 hrs) | HBIG | Birth (≤12 hrs) | ||
2 | 1 mos | 2 | 2 mos | ||
3 | 2–3 mos | 3 | 4 mos | ||
4 | 6 mos¶ | 4 | 6 mos¶ | ||
Unknown | 1 | Birth (≤12 hrs) | 1 | Birth (≤12 hrs) | |
HBIG | Birth (≤12 hrs) | HBIG | Birth (≤12 hrs) | ||
2 | 1 mos | 2 | 2 mos | ||
3 | 2–3 mos | 3 | 4 mos | ||
4 | 6 mos¶ | 4 | 6 mos¶ | ||
Negative | 1 | Hospital discharge or age 1 mo | 1 | Hospital discharge or age 1 mo | |
2 | 2 mos | 2 | 2 mos | ||
3 | 6–18 mos¶ | 3 | 4 mos | ||
4 | 6 mos¶ |
Table 3. Hepatitis B vaccine schedules for infants, by infant birthweight and maternal HBsAg status
Abbreviations: HBIG = hepatitis B immune globulin; HBsAg = hepatitis B surface antigen.
* Mothers should have blood drawn and tested for HBsAg as soon as possible after admission for delivery; if the mother is found to be HBsAg positive, the infant should receive HBIG as soon as possible but no later than age 7 days.
† Pediarix should not be administered before age 6 weeks.
§ HBIG should be administered at a separate anatomical site from vaccine.
¶ The final dose in the vaccine series should not be administered before age 24 weeks (164 days).
Age group | Schedule* (interval represents time in months from first dose) |
---|---|
Children (1–10 yrs) | 0, 1, and 6 mos |
0, 1, 2, and 12 mos | |
Adolescents (11–19 yrs) | 0, 1, and 6 mos |
0, 12, and 24 mos | |
0 and 4–6 mos† | |
0, 1, 2, and 12 mos 0, 7 days, 21–30 days, 12 mos§ |
|
Adults (≥20 yrs) | 0, 1, and 6 mos |
0, 1, 2, and 12 mos 0, 1, 2, and 6 mos¶ 0, 7 days, 21–30 days, 12 mos§ |
Table 4. Hepatitis B vaccine schedules for children, adolescents, and adults
* Refer to package inserts for further information. For all ages, when the HepB vaccine schedule is interrupted, the vaccine series does not need to be restarted. If the series is interrupted after the first dose, the second dose should be administered as soon as possible, and the second and third doses should be separated by an interval of at least 8 weeks. If only the third dose has been delayed, it should be administered as soon as possible. The final dose of vaccine must be administered at least 8 weeks after the second dose and should follow the first dose by at least 16 weeks; the minimum interval between the first and second doses is 4 weeks. Inadequate doses of hepatitis B vaccine or doses received after a shorter-than-recommended dosing interval should be readministered, using the correct dosage or schedule. Vaccine doses administered ≤4 days before the minimum interval or age are considered valid. Because of the unique accelerated schedule for Twinrix, the 4-day guideline does not apply to the first three doses of this vaccine when administered on a 0-day, 7-day, 21–30-day, and 12-month schedule (new recommendation).
†A 2-dose schedule of Recombivax adult formulation (10 µg) is licensed for adolescents aged 11–15 years. When scheduled to receive the second dose, adolescents aged >15 years should be switched to a 3-dose series, with doses 2 and 3 consisting of the pediatric formulation administered on an appropriate schedule.
§ Twinrix is approved for use in persons aged ≥18 years and is available on an accelerated schedule with doses administered at 0, 7, 21–30 days, and 12 months.
¶ A 4-dose schedule of Engerix administered in two 1 mL doses (40 µg) on a 0-, 1-, 2-, and 6-month schedule is recommended for adult hemodialysis patients.
HCP status | Postexposure testing | Postexposure prophylaxis | Postvaccination serologic testing | ||
---|---|---|---|---|---|
Source patient (HBsAg) | HCP testing (anti-HBs) | HBIG | Vaccination | ||
Documented responder after complete series | No action needed | ||||
Documented nonresponder after two complete series | Positive/unknown | –* | HBIG x2 separated by 1 month | – | N/A |
Negative | No action needed | ||||
Response unknown after complete series | Positive/unknown | <10 mIU/mL | HBIG x1 | Initiate revaccination | Yes |
Negative | <10 mIU/mL | None | |||
Any result | <10 mIU/mL | No action needed | |||
Unvaccinated/incompletely vaccinated or vaccine refusers | Positive/unknown | – | HBIG x1 | Complete vaccination | Yes |
Negative | – | None | Complete vaccination | Yes |
Table 5. Postexposure management of health care personnel after occupational percutaneous or mucosal exposure to blood or body fluids, by health care personnel HepB vaccination and response status
Abbreviations: anti HBs = antibody to hepatitis B surface antigen; HBIG = hepatitis B immune globulin; HBsAg = hepatitis B surface antigen; HCP = health care personnel; N/A = not applicable.
* Not indicated.
Exposure* | Management | |
---|---|---|
Unvaccinated person | Previously vaccinated person | |
HBsAg-positive source | HepB vaccine series and HBIG | HepB vaccine dose |
HBsAg status unknown for source | Hep B vaccine series | No management |
Table 6. Postexposure management after distinct nonoccupational percutaneous or mucosal exposure to blood or body fluids
Abbreviations: HepB = hepatitis B; HBsAg = hepatitis B surface antigen; HBIG = hepatitis B immune globulin.
* Exposures include percutaneous (e.g., bite or needlestick) or mucosal exposure to blood or body fluids, sex or needle-sharing contact, or victim of sexual assault/abuse.
AASLD | American Association for the Study of Liver Diseases |
ACIP | Advisory Committee on Immunization Practices |
anti-HBc | antibody to hepatitis B core antigen |
anti-HBe | antibody to hepatitis B e antigen |
anti-HBs | antibody to hepatitis B surface antigen |
HBeAg | hepatitis B e antigen |
HBIG | hepatitis B immune globulin |
HBsAg | hepatitis B surface antigen |
HBV | hepatitis B virus |
HBV | DNA hepatitis B virus deoxyribonucleic acid |
HCP | health care personnel |
HCV | hepatitis C virus |
HepB | hepatitis B |
HIV | human immunodeficiency virus |
IDSA | Infectious Diseases Society of America |
IDU | Injection-drug use |
IgM | Immunoglobulin class M |
IgG | Immunoglobulin class G |
MSM | men who have sex with men |
NNDSS | National Notifiable Diseases Surveillance System |
PHBPP | Perinatal Hepatitis B Prevention Program |
PWID | persons who inject drugs |
QALY | quality-adjusted life-year |
STI | sexually transmitted infection |
VAERS | Vaccine Adverse Events Reporting System |
VSD | Vaccine Safety Datalink |
Box 1. Abbreviations used in this report
|
Box 2. Strategy to eliminate HBV transmission in the United States*
*Sources: Mast EE, Margolis HS, Fiore AE, et al. A comprehensive immunization strategy to eliminate transmission of hepatitis B virus infection in the United States: recommendations of the Advisory Committee on Immunization Practices (ACIP). Part 1: immunization of infants, children, and adolescents. MMWR Recomm Rep 2005;54(No. RR-16):1–31; Mast EE, Weinbaum CM, Fiore AE, et al. A comprehensive immunization strategy to eliminate transmission of hepatitis B virus infection in the United States: recommendations of the Advisory Committee on Immunization Practices (ACIP). Part II: immunization of adults. MMWR Recomm Rep 2006;55(No. RR-16):1–33.
†Refer to Table 3 for prophylaxis recommendations for infants born to women with unknown HBsAg status.
§Within 24 hours of birth for medically stable infants weighing ≥2,000 grams.
¶Refer to Table 3 for birth dose recommendations for infants weighing <2,000 grams.
High (≥8% prevalence): Angola, Benin, Burkina Faso, Burundi, Cameroon, Central African Republic, Congo, Côte d’Ivoire, Djibouti, Equatorial Guinea, Gabon, Gambia, Ghana, Guinea, Haiti, Kiribati, Kyrgyzstan, Laos, Liberia, Malawi, Mali, Mauritania, Mongolia, Mozambique, Namibia, Nauru, Niger, Nigeria, Niue, Papua New Guinea, Senegal, Sierra Leone, Solomon Islands, Somalia, South Sudan, Sudan, Swaziland, Togo, Tonga, Uganda, Vanuatu, Vietnam, Yemen, and Zimbabwe. Intermediate (5%–7.9% prevalence): Albania, Bhutan, Cape Verde, China, Democratic Republic of the Congo, Ethiopia, Kazakhstan, Kenya, Marshall Islands, Moldova, Oman, Romania, Rwanda, Samoa, South Africa, Tajikistan, Tanzania, Thailand, Tunisia, Tuvalu, Uzbekistan, and Zambia Low Intermediate (2%–4.9% prevalence): Algeria, Azerbaijan, Bangladesh, Belarus, Belize, Brunei Darussalam, Bulgaria, Cambodia, Colombia, Cyprus, Dominican Republic, Ecuador, Eritrea, Federated States of Micronesia, Fiji, Georgia, Italy, Jamaica, Kosovo, Libya, Madagascar, Myanmar, New Zealand, Pakistan, Palau, Philippines, Peru, Russia, Saudi Arabia, Singapore, South Korea, Sri Lanka, Suriname, Syria, Tahiti, and Turkey. Low (≤1.9% prevalence): Afghanistan, Argentina, Australia, Austria, Bahrain, Barbados, Belgium, Bolivia, Bosnia and Herzegovina, Brazil, Canada, Chile, Costa Rica, Croatia, Cuba, Czech Republic, Denmark, Egypt, France, Germany, Greece, Guatemala, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Israel, Japan, Jordan, Kuwait, Lebanon, Lithuania, Malaysia, Mexico, Morocco, Nepal, Netherlands, Nicaragua, Norway, Palestine, Panama, Poland, Portugal, Qatar, Serbia, Seychelles, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, UK, United Arab Emirates, United States of America, and Venezuela. No data: Andorra, Antigua and Barbuda, Armenia, The Bahamas, Botswana, Chad, Comoros, Cook Islands, Dominica, El Salvador, Finland, Grenada, Guinea- Bissau, Guyana, Honduras, Latvia, Lesotho, Lithuania, Luxembourg, Macedonia, Maldives, Malta, Mauritius, Monaco, Montenegro, North Korea, Paraguay, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, San Marino, Sao Tome and Principe, Timor-Leste, Trinidad and Tobago, Turkmenistan, and Uruguay. |
Box 3. Prevalence of chronic hepatitis B virus infection, by country*
* Source: CDC. Travelers health: infectious diseases related to travel. Atlanta, GA: US Department of Health and Human Services, CDC; 2017.
|
Box 4. Persons recommended to receive hepatitis B vaccination
The issue: An increasing number of HCP have received routine hepatitis B (HepB) vaccination during childhood. No postvaccination serologic testing is recommended after routine infant or adolescent HepB vaccination. Because vaccine-induced antibody to hepatitis B surface antigen (anti-HBs) wanes over time, testing HCP for anti-HBs years after vaccination might not distinguish vaccine nonresponders from responders. Guidance for health care institutions: Health care institutions may measure anti-HBs upon hire or matriculation for HCP who have documentation of a complete HepB vaccine series in the past (e.g., as part of routine infant or adolescent vaccination). HCP with anti-HBs <10 mIU/mL should receive one or more additional doses of HepB vaccine and retesting (Figure 3). Institutions that decide to not measure anti-HBs upon hire or matriculation for HCP who have documentation of a complete HepB vaccine series in the past should ensure timely assessment and postexposure prophylaxis following an exposure (Table 5). Considerations: The risk for occupational HBV infection for vaccinated HCP might be low enough in certain settings so that assessment of anti-HBs status and appropriate follow-up should be done at the time of exposure to potentially infectious blood or body fluids. This approach relies on HCP recognizing and reporting blood and body fluid exposures and therefore may be applied on the basis of documented low risk, implementation, and cost considerations. Certain HCP occupations have lower risk for occupational blood and body fluid exposures (e.g., occupations involving counseling versus performing procedures), and nontrainees have lower risks for blood and body fluid exposures than trainees. Some settings also will have a lower prevalence of HBV infection in the patient population served than in other settings, which will influence the risk for HCP exposure to HBsAg-positive blood and body fluids. |
Box 5. Testing anti-HBs for health care personnel (HCP) vaccinated in the past
|
Box 6. Persons recommended to receive serologic testing prior to vaccination*
* Serologic testing comprises testing for hepatitis B surface antigen (HBsAg), antibody to HBsAg, and antibody to hepatitis B core antigen.
† Denotes persons also recommended for hepatitis B vaccination. Serologic testing should occur prior to vaccination. Serologic testing should not be a barrier to vaccination of susceptible persons. The first dose of vaccine should typically be administered immediately after collection of the blood for serologic testing.
|
Box 7. Persons recommended to receive postvaccination serologic testing* following a complete series of HepB vaccination
* Postvaccination serologic testing for persons other than infants born to HBsAg-positive (or HBsAg-unknown) mothers consists of anti-HBs.
† Postvaccination serologic testing for infants born to HBsAg-positive (or HBsAg-unknown) mothers consists of anti-HBs and HBsAg. Persons with anti-HBs <10 mIU/mL after the primary vaccine series should be revaccinated. Infants born to HBsAg-positive mothers or mothers with an unknown HBsAg status should be revaccinated with a single dose of HepB vaccine and receive postvaccination serologic testing 1–2 months later. Infants whose anti-HBs remains <10 mIU/mL following single dose revaccination should receive two additional doses of HepB vaccine, followed by postvaccination serologic testing 1–2 months after the final dose. Based on clinical circumstances or family preference, HBsAg-negative infants with anti-HBs <10 mIU/mL may instead be revaccinated with a second, complete 3-dose series, followed by postvaccination serologic testing performed 1–2 months after the final dose of vaccine. For others with anti-HBs <10 mIU/mL after the primary series, administration of 3 additional HepB vaccine doses on an appropriate schedule, followed by anti-HBs testing 1–2 months after the final dose, is usually more practical than serologic testing after ≥1 dose of vaccine.
This activity is intended for infectious disease specialists, family medicine specialists, gastroenterologists, internists, nephrologists, obstetrician-gynecologists, pediatricians, public health officials, nurses, pharmacists, and other clinicians caring for patients with or at risk for hepatitis B virus (HBV) infection.
Describe recommendations regarding prevention of HBV infection in the United States, based on updated guidance from the Advisory Committee on Immunization Practices.
Upon completion of this activity, participants will be able to:
As an organization accredited by the ACCME, Medscape, LLC, requires everyone who is in a position to control the content of an education activity to disclose all relevant financial relationships with any commercial interest. The ACCME defines "relevant financial relationships" as financial relationships in any amount, occurring within the past 12 months, including financial relationships of a spouse or life partner, that could create a conflict of interest.
Medscape, LLC, encourages Authors to identify investigational products or off-label uses of products regulated by the US Food and Drug Administration, at first mention and where appropriate in the content.
Medscape, LLC designates this enduring material for a maximum of 2.5
AMA PRA Category 1 Credit(s)™
. Physicians should claim only the credit commensurate with the extent of their participation in the activity.
Medscape, LLC staff have disclosed that they have no relevant financial relationships.
Successful completion of this CME activity, which includes participation in the evaluation component, enables the participant to earn up to 2.5 MOC points in the American Board of Internal Medicine's (ABIM) Maintenance of Certification (MOC) program. Participants will earn MOC points equivalent to the amount of CME credits claimed for the activity. It is the CME activity provider's responsibility to submit participant completion information to ACCME for the purpose of granting ABIM MOC credit. Aggregate participant data will be shared with commercial supporters of this activity.
Awarded 2.5 contact hour(s) of continuing nursing education for RNs and APNs; 2.5 contact hours are in the area of pharmacology.
Medscape, LLC designates this continuing education activity for 2.5 contact hour(s) (0.250 CEUs) (Universal Activity Number JA0007105-0000-18-022-H01-P).
For questions regarding the content of this activity, contact the accredited provider for this CME/CE activity noted above. For technical assistance, contact [email protected]
There are no fees for participating in or receiving credit for this online educational activity. For information on applicability
and acceptance of continuing education credit for this activity, please consult your professional licensing board.
This activity is designed to be completed within the time designated on the title page; physicians should claim only those
credits that reflect the time actually spent in the activity. To successfully earn credit, participants must complete the
activity online during the valid credit period that is noted on the title page. To receive AMA PRA Category 1 Credit™, you must receive a minimum score of 75% on the post-test.
Follow these steps to earn CME/CE credit*:
You may now view or print the certificate from your CME/CE Tracker. You may print the certificate but you cannot alter it.
Credits will be tallied in your CME/CE Tracker and archived for 6 years; at any point within this time period you can print
out the tally as well as the certificates from the CME/CE Tracker.
*The credit that you receive is based on your user profile.
processing....
HepB vaccination is the mainstay of HBV prevention efforts; HBIG is generally used as an adjunct to HepB vaccine in infants born to HBsAg-positive mothers and in certain other postexposure prophylaxis situations. The first HepB vaccines consisted of plasma-derived HBsAg. Recombinant HepB vaccines containing yeast-derived HBsAg purified by biochemical and biophysical separation techniques replaced the plasma-derived vaccines in the United States by the late 1980s.[64,103,104] HepB vaccines recommended for use in the United States are formulated to contain 10–40 µg of HBsAg protein/mL and do not contain thimerosal as a preservative.[105] HBIG can augment protection until a response to vaccination is attained. For those who do not respond to HepB vaccination, HBIG administered alone is the primary means of protection after an HBV exposure. HBIG provides passively acquired anti-HBs and temporary protection (i.e., 3–6 months). Passively acquired anti-HBs can be detected for 4–6 months after administration of HBIG.[10]
HepB vaccines are available as a single-antigen formulation and in combination with other vaccines. The two single-antigen vaccines recommended for use in the United States, Engerix-B (GlaxoSmithKline Biologicals, Rixensart, Belgium) and Recombivax HB (Merck & Co., Inc., Whitehouse Station, New Jersey), are used for the vaccination of persons starting at birth. Of the two combination vaccines, Pediarix (GlaxoSmithKline Biologicals, Rixensart, Belgium) is used for the vaccination of persons aged 6 weeks–6 years and contains recombinant HBsAg, diphtheria and tetanus toxoids and acellular pertussis adsorbed, and inactivated poliovirus and Twinrix (GlaxoSmithKline Biologicals, Rixensart, Belgium) is used for the vaccination of persons aged ≥18 years and contains recombinant HBsAg and inactivated hepatitis A virus ( Table 2 ). Comvax (Merck & Co., Inc., Whitehouse Station, New Jersey), which was used previously for the vaccination of persons aged 6 weeks–15 months and contained recombinant HBsAg and Haemophilus b conjugate vaccine, has not been available for purchase directly from Merck since January 1, 2015. Discontinuation of Comvax was not related to any product safety or manufacturing issues. Aluminum salts generally are used as adjuvants to enhance the immune response of vaccinated persons.
Two HBIG products are licensed for use in the United States: HepaGam B (Cangene Corporation, Winnipeg, Canada) and Nabi-HB (Biotest Pharmaceuticals Corporation, Boca Raton, Florida). HBIG is prepared from the plasma of donors with high concentrations of anti-HBs. Source plasma tests negative for evidence of HIV, HBV, and HCV. Investigational nucleic acid testing for hepatitis A virus and parvovirus B19 also is performed on pooled samples of source plasma. The manufacturing process contains two steps to inactivate viruses in the final product: the solvent and detergent step inactivates enveloped viruses, and the virus filtration step removes viruses based on their size. HBIG products licensed for use in the United States contain no preservative and are intended for single use only.[106]
The presence of anti-HBs typically indicates immunity against HBV infection. Immunocompetent children and adults who have vaccine-induced anti-HBs levels of ≥10 mIU/mL 1–2 months after having received a complete HepB vaccine series are considered seroprotected and deemed vaccine responders.[107] Vaccine-induced seroprotection is considered a surrogate of clinical protection. Anti-HBs levels wane over time following vaccination related in part to the age at vaccination. Approximately 16% of persons vaccinated at age <1 year have antibody levels of ≥10 mIU/mL 18 years following vaccination, compared with 74% for those vaccinated at age ≥1 year.[10] However, persons initially responding to the full 3-dose HepB vaccine series and who are later found to have anti-HBs <10 mIU/mL remain protected. Most persons (88%) who receive a challenge dose of HepB vaccine 30 years after HepB vaccination as children or adults develop an antibody response of ≥10 mIU/mL indicating persistent immunity to HBV infection.[108] Data from this and other studies suggests protection against acute symptomatic and chronic HBV infection persists for 30 years or more among immunocompetent persons who originally responded to HepB vaccine.[108-110]
The 3-dose HepB vaccine series produces a protective antibody response (anti-HBs ≥10 mIU/mL) in approximately 95% of healthy infants overall (response is lower for infants with lower birth weights)[64] and >90% of healthy adults aged <40 years.[111,112] Among healthy infants, 25% and 63% achieve anti-HBs levels ≥10 mIU/mL after the first and second dose, respectively. Among healthy adults aged <40 years, 30%–55% and 75% achieve anti-HBs levels ≥10 mIU/mL after the first and second dose, respectively.[7,8,64] Vaccine response is decreased among infants weighing <2000 grams and older adults. Other factors (e.g., smoking, obesity, aging, chronic medical conditions, drug use, diabetes, male sex, genetic factors, and immune suppression) contribute to a decreased response to vaccine.[113-116] Although immunogenicity is lower among immunocompromised persons, those who achieve and maintain seroprotective antibody levels before exposure to HBV have a high level of protection.[8]
Birth dose. A birth dose of HepB vaccine serves as postexposure prophylaxis to prevent perinatal HBV infection among infants born to HBV-infected mothers. Although infants requiring postexposure prophylaxis should be identified by maternal HBsAg testing, administration of a birth dose to all infants (even without HBIG) serves as a safeguard to prevent perinatal transmission among infants born to HBsAg-positive mothers not identified prenatally because of lack of maternal HBsAg testing or failures in reporting test results. HepB vaccine or HBIG given alone are 75% and 71% effective in preventing perinatal HBV transmission, respectively; their combined efficacy is 94%.[29,52,117] The birth dose also provides protection to infants at risk from household exposure after the perinatal period.[29,64]
Vaccination produces seroprotection in 98% of healthy term infants. Vaccine response is lower among infants with birth weights <2000 grams.[64] A study among low birth weight infants demonstrated that more infants achieved seroprotective anti-HBs levels when vaccine was initiated at 1 month of age versus within the first 3 days of life (96% vs. 68%, p<0.02).[118] Vaccine response among infants does not vary appreciably by maternal HBsAg status or HBIG administration.[64]
Adolescents. Approximately 95% of adolescents achieve seroprotection following HepB vaccination with a complete series.[7] The adult (10 µg) dose of Recombivax HB administered using a 2-dose compressed schedule at 0 and 4 months or 0 and 6 months for persons aged 11–15 years produces seroprotection proportions nearly equivalent to those obtained with the standard regimen of 5 µg administered on a 3-dose schedule at 0, 1, and 6 months (99.2% vs. 98.3%).[119,120] Data on long-term antibody persistence or protection among adolescents for 2-dose schedules are lacking.
Adults. Vaccination with a complete series results in seroprotection in >90% of healthy adults aged <40 years. Response decreases with age, and seroprotection is achieved in 75% of persons aged 60 years.[8]
Diabetes. A review of studies assessing HepB vaccine response among persons with diabetes mellitus demonstrated seroprotection in 93.9% for children with diabetes mellitus compared with 100% for children without diabetes mellitus.[112,121]
Among adults, 88.2% of those with diabetes mellitus, compared with 93.6% of those without diabetes mellitus, achieved seroprotection.[112] Among hemodialysis/chronic kidney disease patients, the median proportion protected was 60.1% for those with diabetes mellitus, compared with 75.1% for those without diabetes mellitus.[112]
Immunocompromising conditions. The humoral response to HepB vaccine is reduced in children and adults who are immunocompromised (e.g., hematopoietic stem cell transplant recipients, patients undergoing chemotherapy, and HIV-infected persons).[122,123] Modified dosing regimens, including a doubling of the standard antigen dose or administration of additional doses, might increase response rates. However, data on response to these alternative vaccination schedules are limited.[6]
In prelicensure trials, adverse events following HepB vaccination were most commonly injection site reactions and mild systemic reactions.[106] Commonly reported mild adverse events from postmarketing data include pain (3%–29%), erythema (3%), swelling (3%), fever (1%–6%), and headache (3%).[124] The estimated incidence of anaphylaxis among HepB vaccine recipients is 1.1 per million vaccine doses.[125] In 2011, the Institute of Medicine concluded that the evidence convincingly supports a causal relationship between HepB vaccine and anaphylaxis in yeast-sensitive persons, and that the evidence is inadequate to accept or reject a causal relation between HepB vaccine and several neurologic, chronic, and autoimmune diseases.[126]
During early postlicensure surveillance, several adverse events following HepB vaccination have been described in the scientific literature, including Guillain-Barré Syndrome (GBS), chronic fatigue syndrome, optic neuritis, multiple sclerosis, and diabetes mellitus; however, multiple studies have demonstrated no association between receipt of HepB vaccine and these conditions.[126-129] In addition, no evidence of a causal association between rheumatoid arthritis,[130] Bell’s palsy,[131] autoimmune thyroid disease,[132] hemolytic anemia in children,[133] anaphylaxis,[134] optic neuritis,[135] Guillain-Barré Syndrome,[136] sudden-onset sensorineural hearing loss,[137] or other chronic illnesses and receipt of HepB vaccine has been demonstrated through analysis of VSD data.
During 2005–2015, a total of 20,231 reports of adverse events following HepB vaccination among all ages were submitted to VAERS. The majority of primary U.S. reports (15,787 of 20,231, 78%) were following HepB vaccine administered with other vaccines on the same visit. Among these, the percentage classified as serious (i.e., if one or more of the following is reported: death, life-threatening illness, hospitalization or prolongation of existing hospitalization, or permanent disability)† was 16.7%, including 402 deaths, of which 388 were among infants aged 6 weeks–23 months.[138] The most frequently reported adverse events for vaccines given in combination were fever (23%), injection site erythema (11%), and vomiting (10%).[138] Among the 4,444 single-antigen HepB reports, 6.5% were classified as serious, including 43 deaths, of which 27 were among infants aged ≤4 weeks. The most frequently reported adverse events for single-antigen HepB vaccine were nausea/dizziness (8%) and fever/headache (7%).
Vaccine schedules are determined on the basis of immunogenicity data, and, for infants and children, the need to integrate HepB vaccine into a harmonized immunization schedule ( Table 3 and Table 4 ). Primary vaccination generally consists of three intramuscular doses administered on a 0-, 1-, and 6-month schedule ( Table 4 ). Recombivax HB may be administered in a 2-dose schedule at 0 and 4–6 months for persons aged 11–15 years using the adult formulation. Pediarix is administered at ages 2, 4, and 6 months; it is not used for the birth dose. Twinrix may be administered before travel or any other potential exposure on an accelerated schedule at 0, 7, and 21–30 days, followed by a dose at 12 months. HepB vaccination of adult hemodialysis patients consists of high-dose (40 µg) Recombivax HB administered on a 0-, 1-, and 6-month schedule or high-dose (40 µg) Engerix-B administered on a 0-, 1-, 2-, and 6-month schedule.[106]
Alternative vaccination schedules (e.g., 0, 1, and 4 months or 0, 2, and 4 months) have been demonstrated to elicit dose-specific and final rates of seroprotection similar to those obtained on a 0-, 1-, and 6-month schedule. Increasing the interval between the first 2 doses has little effect on immunogenicity or the final antibody concentration.[139-141] The third dose confers the maximum level of seroprotection and provides long-term protection.[142] Longer intervals between the last 2 doses (e.g., 11 months) result in higher final antibody levels[142] but might increase the risk for acquisition of HBV infection among persons who have a delayed response to vaccination. Higher geometric mean titers are associated with longer persistence of measurable anti-HBs.
A challenge dose of HepB vaccine may be used to determine the presence of vaccine-induced immunologic memory through generation of an anamnestic response. The term “booster dose” has been used to refer to a dose of HepB vaccine administered after a primary vaccination series to provide rapid protective immunity against significant infection (i.e., infection resulting in serologic test results positive for HBV and/or clinically significant disease). Among persons who were vaccinated prior to age 1 year and found to have anti-HBs levels <10 mIU/mL 6–18 years later, a single challenge dose of HepB vaccine resulted in anti-HBs levels ≥10 mIU/mL in 60%–97% of those tested. Similar results were found among persons initially vaccinated at age ≥1 year.[10] Immunocompetent persons with a response ≥10 mIU/mL following a challenge dose are considered protected, regardless of subsequent declines in anti-HBs.[10,109]
One study found that of infants born to HBsAg-positive women who were not infected at birth and who did not respond to a primary vaccine series, all developed seroprotective levels of anti-HBs after receipt of 3 additional doses.[143] No data exist that suggest that children who have no detectable antibody after 6 doses of vaccine benefit from additional doses.
Antiviral therapy (i.e., lamivudine, telbivudine, and tenofovir) has been studied as an intervention to reduce perinatal HBV transmission among pregnant women with high HBV DNA levels (e.g., average HBV DNA levels of 7.6 log10 IU/mL).[144] Maternal antiviral therapy started at 28–32 weeks’ gestation, as an adjunct to HepB vaccine and HBIG administered to the infant shortly after delivery, has been associated with significantly reduced rates of perinatal HBV transmission.[5] The use of lamivudine and telbivudine is limited by viral resistance and mutations. Tenofovir is not associated with resistance and is the preferred agent.[5] Available data support the safety of tenofovir during pregnancy, although its use might be associated with reduced bone mineral content in infants with in utero exposure.[5,39,63,144-146] AASLD suggests antiviral therapy to reduce perinatal HBV transmission when maternal HBV DNA is >200,000 IU/mL. Maternal therapy is generally discontinued at birth to 3 months postpartum.[5]
HBV prevention strategies targeting perinatal transmission are considered very cost-effective (i.e., an incremental cost-effectiveness ratio <$25,000). The current strategy of administering HepB vaccine and HBIG within 12 hours of birth for infants born to HBsAg-positive mothers and universal infant vaccination prior to hospital discharge has an incremental cost-effectiveness ratio of $6,957 per quality-adjusted life year (QALY) saved when compared with a strategy of universal infant HepB vaccination prior to hospital discharge alone.[147] CDC’s U.S. Perinatal Hepatitis B Prevention Program (https://www.cdc.gov/hepatitis/partners/perihepbcoord.htm), which provides case management services to infants born to HBsAg-positive women, also has been demonstrated to decrease infections, increase QALYs saved, and be a cost-effective use of resources.[148] A strategy of testing HBsAg-positive pregnant women for HBV DNA, followed by maternal antiviral prophylaxis for women with high HBV DNA, would cost an additional $3 million but would save 2,080 QALYs and prevent 324 chronic HBV infections, and therefore would be considered cost-effective, with an incremental cost-effectiveness ratio of $1,583 per QALY saved.[36]
Cost-effectiveness also has been assessed for HBV prevention strategies outside of the perinatal setting. Vaccinating adults aged 20–59 years with diabetes mellitus costs $75,094 per QALY saved; cost-effectiveness ratios increase with age at vaccination.[149] Among previously vaccinated current HCP (including those in training), pre-exposure anti-HBs testing followed by revaccination and retesting (if necessary, based on anti-HBs levels), compared with no intervention, was not considered cost-effective with an incremental cost per QALY saved of $3–$4 million at year one and approximately $800,000 over 10 years.[150]