Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
About Haemophilus Infections
Haemophilus is the name of a group of bacteria. There are several types of Haemophilus. They can cause different types of illnesses involving breathing, bones and joints, and the nervous system.
One common type, Hib (Haemophilus influenzae type b), causes serious disease. It usually strikes children under 5 years old. Your child can get Hib disease by being around other children or adults who may have the bacteria and not know it. The germs spread from person to person. If the germs stay in the child's nose and throat, the child probably will not get sick. But sometimes the germs spread into the lungs or the bloodstream, and then Hib can cause serious problems such as meningitis and pneumonia.
Treatment is with antibiotics. There is a vaccine to prevent Hib disease. All children younger than 5 years of age should be vaccinated with the Hib vaccine.
Centers for Disease Control and Prevention
It sits within Infections.
The lead U.S. institute for this subject is the National Institute of Allergy and Infectious Diseases.
When to speak to someone. Reading about a topic cannot tell you whether it applies to you. Speak to a doctor or pharmacist if symptoms are severe, sudden, getting worse, or simply not going away — and seek emergency care immediately for chest pain, breathing difficulty, sudden weakness or confusion, or a serious allergic reaction.
Research on Haemophilus Infections
265 studies areregistered for this condition on ClinicalTrials.gov, the U.S. National Library of Medicine's public registry. A selection is below — the links go straight to the registry entry, not to a summary of ours.
What a registered study does and does not mean. Registration means a study exists and has been declared publicly. It says nothing about whether the treatment being tested works, is safe, or is available to you. Many studies find no benefit — that is what research is for. Never seek out an experimental treatment on the strength of a registry entry alone.
Research currently under way
- Phase IV Clinical Study of sIPV Administration in Adolescent and Adult PopulationsSinovac Biotech Co., Ltd
- Clinical Trial of the Adsorbed Acellular Pertussis (Tricomponent) DTaP-Haemophilus Influenzae Type b (Conjugate)-ACYW135 Group Meningococcal (Conjugate) Combined VaccineCanSino Biologics Inc.
- Clinical Trial of Lyophilized Haemophilus Influenzae Type b Conjugate VaccineCanSino Biologics Inc.
- A Phase II/III Study to Evaluate the Immunogenicity, Safety and Lot-to-lot Consistency of LBVD, a Fully Liquid Hexavalent Diphtheria-tetanus-whole Cell Pertussis-hepatitis B-poliovirus-Haemophilus Influenzae Type b Conjugate (DTwP-HepB-IPV-Hib) Vaccine, in Healthy Infants as Primary SeriesLG Chem
- Immunogenicity of Different Primary Immunization Schedules with Inactivated Poliovirus Vaccine (IPV) Plus Pentavalent Vaccine (DTwP-HBV-Hib) or with Hexavalent Vaccine (DTwP-HBV-Hib-IPV)International Centre for Diarrhoeal Disease Research, Bangladesh
- Phase I/II, Open Label, Randomized, Safety and Immunogenicity Following DTwP-Hepatitis B-Hib-IPV Vaccine (Bio Farma) in Indonesian InfantsPT Bio Farma
Research already completed
- Amoxicillin/Clavulanic Acid Susceptibility in Acute Community-acquired Pneumonia Requiring Intensive Care ManagementCentre Hospitalier Intercommunal de Toulon La Seyne sur Mer
- Clinical Study to Assess the Immunogenicity and Safety of Hexavalent Vaccine Containing Reduced Dose IPVSerum Institute of India Pvt. Ltd.
- Systematic Search for Primary Immunodeficiency in Adults With InfectionsUniversity Hospital, Lille
- Exploratory Clinical Study of MT-2301Tanabe Pharma Corporation
- Post-marketing Surveillance Study for the Safety of a DTaP-IPV- HB-PRP~T Vaccine in Republic of KoreaSanofi Pasteur, a Sanofi Company
- Safety and Efficacy of BK1310 Intramuscular Injection in Healthy InfantsTanabe Pharma Corporation
Study data from ClinicalTrials.gov, a service of the U.S. National Library of Medicine. Retrieved 2026-07-30. Registry entries are supplied by study sponsors and investigators; ClinicalTrials.gov does not verify their scientific validity. PocketsInfo is not affiliated with, and not endorsed by, the NLM or the NIH.
Where to read more
Rather than paraphrase, we point you to the primary sources. Every link below is to a government health agency, a national institute or a recognised medical body — grouped by what you are trying to find out.
Start Here
- About Haemophilus influenzae DiseaseCenters for Disease Control and Prevention
- Haemophilus Influenzae Type B (Hib): Questions and AnswersImmunization Action Coalition
- Hib VaccinationCenters for Disease Control and Prevention
Symptoms
- Haemophilus influenzae Disease Symptoms and ComplicationsCenters for Disease Control and Prevention
Diagnosis and Tests
- Haemophilus Influenzae Type bAmerican Academy of Pediatrics
Prevention and Risk Factors
- Risk Factors for Haemophilus influenzae DiseaseCenters for Disease Control and Prevention
Related Issues
- EpiglottitisMayo Foundation for Medical Education and Research
Clinical Trials
- ClinicalTrials.gov: Haemophilus InfectionsNational Institutes of Health
- ClinicalTrials.gov: Haemophilus influenzae type bNational Institutes of Health
Patient Handouts
- Haemophilus Influenzae Type b (Hib) Vaccine: What You Need to KnowCenters for Disease Control and Prevention
Medical subject headings
Clinicians and researchers index this subject under Haemophilus Infections. These are the terms to use when searching medical literature.
This page is built from the MedlinePlus health topic record for Haemophilus Infections, a service of the U.S. National Library of Medicine (NLM), National Institutes of Health. Information is from MedlinePlus.gov. PocketsInfo is not affiliated with, and is not endorsed by, the NLM or the NIH. Retrieved 30 July 2026.