Haemophilus Influenza Type B (Hib) Vaccines

Safety Information

Hib and How to Protect Against It

Haemophilus influenzae type b (Hib) is a type of bacteria that can cause severe illness, including infections of the covering of the brain and spinal cord (meningitis), lung infections (pneumonia), and severe throat infections (epiglottitis). You can protect against Hib with safe, effective vaccination.

Hib Vaccine Side Effects

The Hib vaccine is very safe, and it is effective at preventing Hib. Vaccines, like any medicine, can have side effects. Most people who get Hib vaccine do not have any problems with it.

Common Side Effects of Hib Vaccine
  • Redness, warmth, or swelling from the shot
  • Fever

When these side effects happen, they usually start within a day of vaccination and last up to 3 days.  On very rare occasions, people have had severe (anaphylactic) allergic reactions to the vaccine.

Available Hib Vaccines

There are six Hib vaccines approved for use in the United States, three of which are combined with vaccines for other diseases:

Hib-only Vaccines:


Combination Vaccines:

How CDC Monitors Vaccine Safety

CDC and FDA monitor the safety of vaccines after they are approved or authorized. If a problem is found with a vaccine, CDC and FDA will inform health officials, health care providers, and the public.

CDC uses 3 systems to monitor vaccine safety:

A Closer Look at the Safety Data

  • A studyexternal icon of the safety of Hib vaccines (PedvaxHIB, ActHIB, Hiberix, Comvax, Pentacel) in VAERS did not find any new or unexpected safety concerns and reconfirmed the safety of Hib vaccines.
  • An additional evaluationexternal icon of Comvax showed no concerning safety patterns.
  • A studyexternal icon using VSD records did not find an increased risk for seizures, meningitis/encephalitis/myelitis, allergic reactions, or fever among children younger than 1 year of age.

Related Scientific Articles

Black S, Greenberg DP. A combined diphtheria, tetanus, five-component acellular pertussis, poliovirus, and Haemophilus influenzae type b vaccineexternal icon. Expert Rev Vaccines 2005 Dec;4(6):793-805.

CDC. Prevention and Control of Haemophilus influenzae type b Disease: Recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR. 2014;63(No. RR-1):1-14.

Davis RL, Black S, Shinefield H, Mahoney L, Zavitkovsky A, Lewis E, et al. Post-marketing evaluation of the short term safety of COMVAXexternal icon. Vaccine. 2004 Jan 2;22(3-4):536-43.

Decker MD, Edwards KM, Bradley R, Palmer P. Comparative trial in infants of four conjugate Haemophilus influenzae type b vaccinesexternal icon. J Pediatr. 1992 Feb;120(2 Pt 1):184-9.

Fritzell B, Plotkin S. Efficacy and safety of a Haemophilus influenzae type b capsular polysaccharide-tetanus protein conjugate vaccineexternal icon. J Pediatr. 1992 Sep;121(3):355-62.

Guerra FA, Blatter MM, Greenberg DP, Pichichero M, Noriega FR. Pentacel Study Group. Safety and immunogenicity of a pentavalent vaccine compared with separate administration of licensed equivalent vaccines in US infants and toddlers and persistence of antibodies before a preschool booster dose: A randomized, clinical trialexternal icon. Pediatrics. 2009 Jan;123(1):301-12.

Holmes SJ, Fritzell B, Guito KP, Esbenshade JF, Blatter MM, Reisinger KS, et al. Immunogenicity of Haemophilus influenzae type b polysaccharide-tetanus toxoid conjugate vaccine in infantsexternal icon. Am J Dis Child. 1993 Aug;147(8):832-6.

Moro PL, Jankosky C, Menschik D, Lewis P, Duffy J, Stewart B, et al. Adverse events following Haemophilus influenzae type b (Hib) vaccines in the Vaccine Adverse Event Reporting System (VAERS), 1990-2013external icon. J Pediatr. 2015 Apr;166(4):992-7.

Nelson JC, Yu O, Dominguez-Islas CP, Cook AJ, Peterson D, Greene SK. Adapting group sequential methods to observational postlicensure vaccine safety surveillance: Results of a pentavalent combination DTaP-IPV-Hib vaccine safety studyexternal icon. Am J Epidemiol. 2013 Jan 15;177(2):131-41.

Rinderknecht S, Bryant KA, Nolan T, Pavia-Ruz N, Doniz CA, Weber MA, et al. The safety profile of Haemophilus influenzae type b-Neisseria meningitidis serogroups C and Y tetanus toxoid conjugate vaccine (HibMenCY)external icon. Hum Vaccin Immunother. 2012 Mar;8(3):304-11.