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Updated: Aug 30, 2026

Assessing Respiratory Immune Responses to Haemophilus Influenzae
Published on: June 29, 2021
Immunization with Haemophilus influenzae (Hib) conjugate vaccine following discharge from hospital
B Olowokure1, N J Spencer, J I Hawker
1Public Health Laboratory Service Communicable Disease Surveillance Centre, 2nd Floor Lincoln House, Birmingham Heartlands Hospital, Birmingham B9 5SS, UK. bolowokure@cdscwmid.demon.co.uk
Insights
Many children with invasive Haemophilus influenzae type b (Hib) disease were not vaccinated before hospital admission. Delayed Hib conjugate vaccination after discharge significantly reduces individual and community protection.
Area of Science:
- Pediatric Infectious Diseases
- Vaccinology
- Public Health
Background:
- Assessing Haemophilus influenzae type b (Hib) conjugate vaccine status post-hospitalization is crucial.
- Understanding vaccination timeliness in unvaccinated children after discharge is essential for disease prevention.
Purpose of the Study:
- To determine Hib conjugate vaccination status of children after hospital discharge.
- To evaluate the time lag for Hib conjugate vaccination in unvaccinated children post-discharge.
Main Methods:
- A population-based cross-sectional survey was conducted.
- Participants included children aged 3-59 months with laboratory-confirmed invasive H. influenzae disease.
Main Results:
- 82% of eligible children had not received the Hib conjugate vaccine before admission.
- No children received the vaccine before hospital discharge.
- Vaccination post-discharge averaged 110 days, with 28% remaining unvaccinated.
Conclusions:
- Delayed Hib conjugate vaccination post-discharge was observed in the early post-vaccine era.
- This delay diminishes the protective benefits of vaccination for both individuals and the community.
Background:
This study was undertaken to ascertain Haemophilus influenzae type b (Hib) conjugate vaccination status following discharge from hospital and to determine the time taken to vaccinate with Hib conjugate vaccine following hospital discharge of unvaccinated children.
Materials And Methods:
Population-based cross-sectional survey involving children aged 3-59 months admitted to a hospital with laboratory confirmed invasive H. influenzae disease.
Results:
Of 51 eligible children, 42 (82%) had not received Hib conjugate vaccine prior to admission. No children were immunized prior to discharge. Vaccination following discharge took an average of 110 days (range 3-441 days). More than one quarter (28%) remained unvaccinated following discharge. If these children had been immunized, immunization coverage among this group of children would have increased significantly from 73% to 98% (p = 0.0017).
Conclusion:
In the immediate post-Hib conjugate vaccine period, delayed immunization after discharge was identified. This reduces the individual and community benefits of immunization.
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