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Nabi HB

Last reviewed on RxList: 10/29/2009
Drug Description

Nabi-HB®
Hepatitis B Immune Globulin (Human)
Solvent/Detergent Treated and Filtered

DESCRIPTION

Hepatitis B Immune Globulin (Human), Nabi-HB (hepatitis b vaccine recombinant) , is a sterile solution of immunoglobulin (5 ± 1% protein) containing antibodies to hepatitis B surface antigen (anti-HBs). It is prepared from plasma donated by individuals with high titers of anti-HBs. The plasma is processed using a modified Cohn 6 / Oncley 9 cold-alcohol fractionation process1,2 with two added viral reduction steps described below. Nabi-HB (hepatitis b vaccine recombinant) is formulated in 0.075 M sodium chloride, 0.15 M glycine, and 0.01% polysorbate 80, at pH 6.2. The product is supplied as a nonturbid sterile liquid in single dose vials and appears as clear to opalescent. It contains no preservative and is intended for single use by the intramuscular route only.

The manufacturing steps for Nabi-HB (hepatitis b vaccine recombinant) are designed to reduce the risk of transmission of viral disease. The solvent/detergent treatment step, using tri-n-butyl phosphate and Triton® X-100, is effective in inactivating known enveloped viruses such as hepatitis B virus (HBV), hepatitis C virus (HCV), and human immunodeficiency virus (HIV)3. Virus filtration, using a Planova® 35 nm Virus Filter, is effective in reducing some known enveloped and non-enveloped viruses4. The inactivation and reduction of known enveloped and non-enveloped model viruses were validated in laboratory studies as summarized in the following table:

Table 1 : Log Reduction of Test Viruses5

  Test Virus
  HIV BVD PRV EMC PPV
Model Virus: HIV HCV HBV Hepatitis A PVB19
Envelope/Genome: yes/RNA yes/RNA yes/DNA no/RNA no/DNA
Manufacturing Step
Precipitation of Cohn Fraction III > 5.9 3.6 3.7 4.4 3.9
Cuno Filtration NT NT NT > 6.6 5.4
Solvent/Detergent > 4.2 > 6.9 > 6.4 NT NT
Nanofiltration > 7.4 > 6.9 > 5.7 3.0 0.7 *
Cumulative > 17.5 > 17.4 > 15.8 > 14.0 9.3
BVD = Bovine Viral Diarrhea Virus
EMC = Encephalomyocarditis Virus
HIV = Human Immunodeficiency Virus
PVB19 = Parvovirus B19
PPV = Porcine Parvovirus
PRV = Pseudorabies Virus
NT = not tested
* Value not included in cumulative clearance

Product potency is expressed in international units (IU) by comparison to the World Health Organization (WHO) standard. Each milliliter (mL) of product contains greater than 312 IU anti-HBs. The potency of each milliliter of Nabi-HB (hepatitis b vaccine recombinant) exceeds the potency of anti-HBs in a U.S. reference hepatitis B immune globulin (FDA). The U.S. reference has been tested by Nabi® Biopharmaceuticals against the WHO standard and found to be equal to 208 IU/mL.

REFERENCES

1. Cohn E.J., Strong W.L., Mulford D.J., Ashworth J.N., Melin M., Taylor H.L. Preparation and Properties of Serum and Plasma Proteins IV. A system for the separation into fractions of the protein and lipoprotein components of biological tissues and fluids. J Am Chem Soc 1946, 68: 459-475.

2. Oncley J.L, Melin M, Richert D.A, Cameron J. W, Gross P.M. The separation of antibodies, isoagglutinins, prothrombin, plasminogen and b1-lipoproteins into sub-fractions of human plasma. J Am Chem Soc 1949, 71:541-550.

3. Horowitz B: Investigations into the application of tri(n-butyl)phosphate/detergent mixtures to blood derivatives. Morgenthaler J (ed): Virus Inactivation in Plasma Products, Curr Stud Hematol Blood Transfus 1989; 56:83-96.

4. Burnouf T: Value of virus filtration as method for improving the safety of plasma products. Vox Sang 1996; 70:235-236.

5. Unpublished data on file, Viral Validation Study Reports, Nabi® Biopharmaceuticals.

For Consumers

What are the possible side effects of hepatitis B immune globulin (HepaGam B, HepaGam B NovaPlus, Hyperhep B, Nabi-HB)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

  • increased blood pressure (severe headache, blurred vision, trouble concentrating, chest pain, numbness, seizure);
  • left-sided stomach pain; or
  • nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or...
Indications & Dosage

INDICATIONS

Nabi-HB, Hepatitis B Immune Globulin (Human), is indicated for treatment of acute exposure to blood containing HBsAg, perinatal exposure of infants born to HBsAg-positive mothers, sexual exposure to HBsAg-positive persons and household exposure to persons with acute HBV infection in the following settings:

  • Acute Exposure to Blood Containing HBsAg
    Following either parenteral exposure (needlestick, bite, sharps), direct mucous membrane contact (accidental splash), or oral ingestion (pipetting accident), involving HBsAg-positive materials such as blood, plasma, or serum.
  • Perinatal Exposure of Infants Born to HBsAg-positive Mothers
    Infants born to mothers positive for HBsAg with or without HBeAg12.
  • Sexual Exposure to HBsAg-positive Persons
    Sexual partners of HBsAg-positive persons.
  • Household Exposure to Persons with Acute HBV Infection
    Infants less than 12 months old whose mother or primary caregiver is positive for HBsAg.
    Other household contacts with an identifiable blood exposure to the index patient.

Nabi-HB (hepatitis b vaccine recombinant) is indicated for intramuscular use only.

DOSAGE AND ADMINISTRATION

This product is for intramuscular use only. The use of this product by the intravenous route is not indicated. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration.

It is important to use a separate vial, sterile syringe, and needle for each individual patient, in order to prevent transmission of infectious agents from one person to another. Any vial of Nabi-HB, Hepatitis B Immune Globulin (Human) that has been entered should be used promptly. Do not reuse or save for future use. This product contains no preservative; therefore, partially used vials should be discarded immediately.

Hepatitis B Immune Globulin (Human) may be administered at the same time (but at a different site), or up to one month preceding hepatitis B vaccination without impairing the active immune response to hepatitis B vaccine11.

  • Acute Exposure to Blood Containing HBsAg
    Table 2 summarizes prophylaxis for percutaneous (needlestick, bite, sharps), ocular, or mucous membrane exposure to blood according to the source of exposure and vaccination status of the exposed person. For greatest effectiveness, passive prophylaxis with Hepatitis B Immune Globulin (Human) should be given as soon as possible after exposure, as its value after seven days following exposure is unclear12. An injection of 0.06 mL/kg of body weight should be administered intramuscularly as soon as possible after exposure and within 24 hours, if possible. Consult the hepatitis B vaccine package insert for dosage information regarding the vaccine.

    For persons who refuse hepatitis B vaccine or are known non-responders to vaccine, a second dose of Hepatitis B Immune Globulin (Human) should be given one month after the first dose12.

Table 2 : Recommendations for Hepatitis B Prophylaxis Following Percutaneous or Permucosal Exposure12

  Exposed Person
Source Unvaccinated Vaccinated
HBsAg-positive
  1. Hepatitis B Immune Globulin (Human) X 1 immediately*
  2. Initiate HB vaccine series†
  1. Test exposed person for anti-HBs
  2. If inadequate antibody&Daffer;, Hepatitis B Immune Globulin (Human) X 1 immediately plus either HB vaccine booster dose or second dose of Hepatitis B Immune Globulin (Human) one month later§
Known Source - High Risk for HBsAg-positive
  1. Initiate HB vaccine series
  2. Test source for HBsAg. If positive, Hepatitis B Immune Globulin (Human) X 1
  1. Test source for HBsAg only if exposed is vaccine nonresponder; if source is HBsAg-positive, give Hepatitis B Immune Globulin (Human) X 1 immediately plus either HB vaccine booster dose or second dose of Hepatitis B Immune Globulin (Human) one month later§
Known Source - Low Risk for HBsAg-positive Initiate HB vaccine series Nothing required
Unknown Source Initiate HB vaccine series Nothing required
* Hepatitis B Immune Globulin (Human) dose of 0.06 mL/kg IM.
† See manufacturers' recommendation for appropriate dose.
‡ Less than 10 mIU/mL anti-HBs by radioimmunoassay, negative by enzyme immunoassay.
§ Two doses of Hepatitis B Immune Globulin (Human) is preferred if no response after at least four doses of vaccine.

  • Prophylaxis of Infants Born to Mothers who are Positive for HBsAg with or without HBeAg
    Table 3 contains the recommended schedule of hepatitis B prophylaxis for infants born to mothers that are either known to be positive for HBsAg or have not been screened. Infants born to mothers known to be HBsAg-positive should receive 0.5 mL Hepatitis B Immune Globulin (Human) after physiologic stabilization of the infant and preferably within 12 hours of birth. The hepatitis B vaccine series should be initiated simultaneously, if not contraindicated, with the first dose of the vaccine given concurrently with the Hepatitis B Immune Globulin (Human), but at a different site. Subsequent doses of the vaccine should be administered in accordance with the recommendations of the manufacturer.

Women admitted for delivery, who were not screened for HBsAg during the prenatal period, should be tested. While test results are pending, the newborn infant should receive hepatitis B vaccine within 12 hours of birth (see manufacturers' recommendations for dose). If the mother is later found to be HBsAg-positive, the infant should receive 0.5 mL Hepatitis B Immune Globulin (Human) as soon as possible and within seven days of birth; however, the efficacy of Hepatitis B Immune Globulin (Human) administered after 48 hours of age is not known10,19. Testing for HBsAg and anti-HBs is recommended at 12-15 months of age. If HBsAg is not detectable and anti-HBs is present, the child has been protected12.

Table 3 : Recommended Schedule of Hepatitis B Immunoprophylaxis to Prevent Perinatal Transmission of Hepatitis B Virus Infection 19

  Age of Infant
Administer Infant Born to mother known to be HBsAg-positive Infant born to mother not screened for HBsAg
First Vaccination* Birth (within 12 hours) Birth (within 12 hours)
Hepatitis B Immune Globulin (Human)† Birth (within 12 hours) If mother is found to be HBsAg-positive, administer dose to infant as soon as possible, not later than 1 week after birth
Second Vaccination* 1 month 1-2 months
Third Vaccination* 6 months‡ 6 months‡
* See manufacturers' recommendations for appropriate dose.
† 0.5 mL administered IM at a site different from that used for the vaccine.
‡See ACIP recommendation.

  • Sexual Exposure to HBsAg-positive Persons
    All susceptible persons whose sexual partners have acute hepatitis B infection should receive a single dose of Hepatitis B Immune Globulin (Human) (0.06 mL/kg) and should begin the hepatitis B vaccine series, if not contraindicated, within 14 days of the last sexual contact or if sexual contact with the infected person will continue. Administering the vaccine with Hepatitis B Immune Globulin (Human) may improve the efficacy of post exposure treatment. The vaccine has the added advantage of conferring long-lasting protection19.
  • Household Exposure to Persons with Acute HBV Infection
    Prophylaxis of an infant less than 12 months of age with 0.5 mL Hepatitis B Immune Globulin (Human) and hepatitis B vaccine is indicated if the mother or primary caregiver has acute HBV infection. Prophylaxis of other household contacts of persons with acute HBV infection is not indicated unless they had an identifiable blood exposure to the index patient, such as by sharing toothbrushes or razors. Such exposures should be treated like sexual exposures. If the index patient becomes an HBV carrier, all household contacts should receive hepatitis B vaccine19.

HOW SUPPLIED

Nabi-HB, Hepatitis B Immune Globulin (Human), is supplied as:

NDC Number Contents
59730-4202-1 a carton containing a 1 mL dose in a single-use vial ( > 312 IU) and
59730-4204-1 package insert
59730-4203-1 a carton containing a 5 mL dose in a single-use vial ( > 1560 IU) and
59730-4205-1 package insert

Storage

Refrigerate between 2 to 8 °C (36 to 46 °F). Do not freeze. Do not use after expiration date. Use within 6 hours after the vial has been entered.

REFERENCES

10.Beasley RP, et al.: Efficacy of hepatitis B immune globulin for prevention of perinatal transmission of the hepatitis B virus carrier state: Final report of a randomized double-blind, placebo - controlled trial. Hepatology 1983; 3:135-141.

11.Szmuness W, et al.: Passive active immunisation against hepatitis B: Immunogenicity studies in adult Americans. Lancet 1981; 1:575-577.

12.Centers for Disease Control: Recommendations for protection against viral hepatitis. Recommendations of the Immunization Practices Advisory Committee (ACIP). MMWR 1985; 34(22):313-335.

19.Centers for Disease Control: Hepatitis B virus: A comprehensive strategy for eliminating transmission in the United States through universal childhood vaccination. Recommendations of the Immunization Practices Advisory Committee (ACIP). MMWR 1991; 40(13):1-25.

Manufactured by: Nabi® Biopharmaceuticals Boca Raton, FL 33487. June 2003.

Side Effects & Drug Interactions

SIDE EFFECTS

Fifty male and female volunteers received Nabi-HB, Hepatitis B Immune Globulin (Human), intramuscularly in pharmacokinetics trials20. The number of patients with reactions related to the administration of Nabi-HB (hepatitis b vaccine recombinant) included local reactions such as erythema 6 (12%) and ache 2 (4%) at the injection site, as well as systemic reactions such as headache 7 (14%), myal-gia 5 (10%), malaise 3 (6%), nausea 2 (4%), and vomiting 1 (2%). The majority (92%) of reactions were reported as mild. The following adverse events were reported in the phar-macokinetics trials and were considered probably related to Nabi-HB (hepatitis b vaccine recombinant) : elevated alkaline phos-phatase 2 (4%), ecchymosis 1 (2%), joint stiffness 1 (2%), elevated AST 1 (2%), decreased WBC 1 (2%), and elevated creatinine 1 (2%). All adverse events were mild in intensity. There were no serious adverse events.

No anaphylactic reactions with Nabi-HB (hepatitis b vaccine recombinant) have been reported. However, these reactions, although rare, have been reported following the injection of human immune globulins23.

DRUG INTERACTIONS

Vaccination with live virus vaccines should be deferred until approximately three months after administration of Nabi-HB, Hepatitis B Immune Globulin (Human). It may be necessary to revaccinate persons who received Nabi-HB (hepatitis b vaccine recombinant) shortly after live virus vaccination.

There are no available data on concomitant use of Nabi-HB (hepatitis b vaccine recombinant) and other drugs; therefore, Nabi-HB (hepatitis b vaccine recombinant) should not be mixed with other drugs.

REFERENCES

20. Data on file, Nabi® Biopharmaceuticals

23. Ellis EF, Henney CS: Adverse reactions following administration of human gamma globulin. J Allerg 1969; 43:45-54.

Warnings & Precautions

WARNINGS

In patients who have severe thrombocytopenia or any coagulation disorder that would contraindicate intramuscular injections, Nabi-HB, Hepatitis B Immune Globulin (Human), should be given only if the expected benefits outweigh the potential risks.

Nabi-HB is made from human plasma. Products made from human plasma may contain infectious agents, e.g., viruses, and theoretically, the Creutzfeldt-Jakob disease (CJD) agent. The risk that such products can transmit an infectious agent has been reduced by screening plasma donors for prior exposure to certain viruses, by testing for the presence of certain current viral infections, and by inactivating and/or reducing certain viruses. The Nabi-HB (hepatitis b vaccine recombinant) manufacturing process includes a solvent/detergent treatment step (using tri-n-butyl phosphate and Triton® X-100) that is effective in inactivating known enveloped viruses such as HBV, HCV, and HIV. Nabi-HB (hepatitis b vaccine recombinant) is filtered using a Planova® 35 nm Virus Filter that is effective in reducing the levels of some enveloped and non-enveloped viruses. These two processes are designed to increase product safety. Despite these measures, such products can still potentially transmit disease. There is also the possibility that unknown infectious agents may be present in such products. ALL infections thought by a physician possibly to have been transmitted by this product should be reported by the physician or other health care provider to Nabi® Biopharmaceuticals at 1-800-458-4244. The physician should discuss the risks and benefits of this product with the patient.

PRECAUTIONS

General

Nabi-HB, Hepatitis B Immune Globulin (Human), must be administered only intramuscularly for post-exposure prophylaxis. The preferred sites for intramuscular injections are the anterolateral aspect of the upper thigh and the deltoid muscle. If the buttock is used due to the volume to be injected, the central region should be avoided; only the upper, outer quadrant should be used, and the needle should be directed anterior (i.e., not inferior or perpendicular to the skin) to minimize the possibility of involvement with the sciatic nerve22.

The 50 healthy volunteers who received Nabi-HB (hepatitis b vaccine recombinant) in pharmacokinetic studies were followed for 84 days for possible development of anti-HCV antibodies. No subject seroconverted.

Pregnancy Category C

Animal reproduction studies have not been conducted with Nabi-HB (hepatitis b vaccine recombinant) . It is also not known whether Nabi-HB (hepatitis b vaccine recombinant) can cause fetal harm when administered to a pregnant woman or can affect a woman's ability to conceive. Nabi-HB (hepatitis b vaccine recombinant) should be given to a pregnant woman only if clearly indicated.

Nursing Mothers

It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when Nabi-HB (hepatitis b vaccine recombinant) is administered to a nursing mother.

Pediatric Use

Safety and effectiveness in the pediatric population have not been established for Nabi-HB (hepatitis b vaccine recombinant) . However, the safety and effectiveness of similar hepatitis B immune globulins have been demonstrated in infants and children12.

Geriatric Use

Clinical studies of Nabi-HB (hepatitis b vaccine recombinant) did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently than younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients.

REFERENCES

12. Centers for Disease Control: Recommendations for protection against viral hepatitis. Recommendations of the Immunization Practices Advisory Committee (ACIP). MMWR 1985; 34(22):313-335.

22. Centers for Disease Control: General recommendations on immunization. Recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR 1994; 43:1-38.

Overdosage & Contraindications

OVERDOSE

Although no data are available, clinical experience reported with other human immune globulins suggests that the only manifestations of overdose with Nabi-HB, Hepatitis B Immune Globulin (Human), would be pain and tenderness at the injection site.

CONTRAINDICATIONS

Individuals known to have had an anaphylactic or severe systemic reaction to human globulin should not receive Nabi-HB, Hepatitis B Immune Globulin (Human), or any other human immune globulin. Nabi-HB (hepatitis b vaccine recombinant) contains less than 100 micrograms per mL IgA. Individuals who are deficient in IgA may have the potential to develop IgA antibodies and have an anaphylac-toid reaction. The physician must weigh the potential benefit of treatment with Nabi-HB (hepatitis b vaccine recombinant) against the potential for hypersensitivity reactions.

Clinical Pharmacology

CLINICAL PHARMACOLOGY

Hepatitis B Immune Globulin (Human) products provide passive immunization for individuals exposed to the hepatitis B virus as evidenced by a reduction in the attack rate of hepatitis B following use6-9.

Clinical studies10,11 conducted prior to 1983 with hepatitis B immune globulins similar to Nabi-HB (hepatitis b vaccine recombinant) indicate the advantage of simultaneous administration of hepatitis B vaccine and Hepatitis B Immune Globulin (Human). The Centers for Disease Control and Prevention Advisory Committee on Immunization Practices (ACIP) advises that the combination prophylaxis be provided in certain instances of exposure based upon the increased efficacy found with that regimen in neonates12. Cases of hepatitis B are rarely seen following exposure to HBV in persons with preexisting anti-HBs. However, no prospective studies have been performed on the efficacy of concurrent hepatitis B vaccine and Hepatitis B Immune Globulin (Human) administration following parenteral exposure, mucous membrane contact, or oral ingestion in adults.

Infants born to HBsAg-positive mothers are at risk of being infected with HBV and becoming chronic carriers13. The risk is especially great if the mother is also HBeAg-positive14. Studies conducted with hepatitis B immune globulins similar to Nabi-HB (hepatitis b vaccine recombinant) indicated that for an infant with peri-natal exposure to an HBsAg-positive and HBeAg-positive mother, a regimen combining one dose of Hepatitis B Immune Globulin (Human) at birth with the hepatitis B vaccine series started soon after birth is 85-98% effective in preventing development of the HBV carrier state15-17. Regimens involving either multiple doses of Hepatitis B Immune Globulin (Human) alone or the vaccine series alone have a 70-90% efficacy, while a single dose of Hepatitis B Immune Globulin (Human) alone has 50% efficacy18.

Since infants have close contact with primary caregivers and they have a higher risk of becoming HBV carriers after acute HBV infection, prophylaxis of an infant less than 12 months of age with Hepatitis B Immune Globulin (Human) and hepatitis B vaccine is indicated if the mother or primary caregiver has acute HBV infection19.

Sexual partners of HBsAg-positive persons are at increased risk of acquiring HBV infection. A single dose of Hepatitis B Immune Globulin (Human) is 75% effective if administered within two weeks of the last sexual exposure to a person with acute hepatitis B19.

Pharmacokinetics

Pharmacokinetics trials20 of Nabi-HB, Hepatitis B Immune Globulin (Human), given intramuscularly to 50 healthy volunteers demonstrated pharmacokinetic parameters similar to those reported by Scheiermann and Kuwert21. The half-life for Nabi-HB (hepatitis b vaccine recombinant) was 23.1 ± 5.5 days. The clearance rate was 0.35 ± 0.12 L/day and the volume of distribution was 11.2 ± 3.4 L.

Maximum concentration of Nabi-HB (hepatitis b vaccine recombinant) was reached in 6.5 ±4.3 days. The maximum concentration of anti-HBs and the area under the time-concentration curve achieved by Nabi-HB (hepatitis b vaccine recombinant) were bio-equivalent to that of another licensed Hepatitis B Immune Globulin (Human) when compared in the same pharmacokinetics trial. Comparability of pharmacokinetics between Nabi-HB (hepatitis b vaccine recombinant) and a commercially available hepatitis B immunoglobulin indicate that similar efficacy of Nabi-HB (hepatitis b vaccine recombinant) should be inferred.

REFERENCES

6. Grady GF, and Lee VA: Hepatitis B immune globulin - prevention of hepatitis from accidental exposure among medical personnel. N Engl J Med 1975; 293:1067-1070.

7. Seeff LB, et al.: Type B hepatitis after needle-stick exposure: Prevention with hepatitis B immune globulin. Ann Int Med 1978; 88:285-293.

8. Krugman S, and Giles JP: Viral hepatitis, type B (MS-2-strain). Further observations on natural history and prevention. N Engl J Med 1973; 288:755-760.

9. Hoofnagle JH, et al.: Passive - active immunity from hepatitis B immune globulin. Ann Int Med 1979; 91:813-818.

10. Beasley RP, et al.: Efficacy of hepatitis B immune globulin for prevention of perinatal transmission of the hepatitis B virus carrier state: Final report of a randomized double-blind, placebo - controlled trial. Hepatology 1983; 3:135-141.

11. Szmuness W, et al.: Passive active immunisation against hepatitis B: Immunogenicity studies in adult Americans. Lancet 1981; 1:575-577.

12. Centers for Disease Control: Recommendations for protection against viral hepatitis. Recommendations of the Immunization Practices Advisory Committee (ACIP). MMWR 1985; 34(22):313-335.

13. Shiraki Y, et al.: Hepatitis B surface antigen and chronic hepatitis in infants born to asymptomatic carrier mothers. Am J Dis Child 1977; 131:644-647.

14. Beasley RP, et al.: The e antigen and vertical transmission of hepatitis B surface antigen. Am J Epidemiol 1977; 105:94-98.

15. Wong VCW, et al.: Prevention of the HBsAg carrier state in newborn infants of mothers who are chronic carriers of HBsAg and HBeAg by administration of hepatitis B vaccine and hepatitis B immunoglobulin: Double-blind randomized placebo-controlled study. Lancet 1984; 1:921-926.

16. Poovorawan Y, et al.: Long term hepatitis B vaccine in infants born to hepatitis B e antigen positive mothers. Archives of Diseases in Childhood 1997; 77:F47-F51.

17. Stevens CE, et al.: Perinatal Hepatitis B virus transmission in the United States: Prevention by passive-active immunization. JAMA 1985; 253:1740-1745.

18. Jhaveri R, et al.: High titer multiple dose therapy with HBIG in newborn infants of HBsAg positive mothers. J Pediatr 1980; 97:305-308.

19. Centers for Disease Control: Hepatitis B virus: A comprehensive strategy for eliminating transmission in the United States through universal childhood vaccination. Recommendations of the Immunization Practices Advisory Committee (ACIP). MMWR 1991; 40(13):1-25.

20. Data on file, Nabi® Biopharmaceuticals

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