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Haemophilus influenzae type b anticapsular antibody responses to PRP-pertussis and PRP-D vaccines in Alaska native
J I Ward1, G Brenneman, M Lepow
1Department of Pediatrics, Harbor-UCLA Medical Center, Torrance 90509.
Insights
Immune responses to Haemophilus influenzae type b (Hib) conjugate vaccines showed no significant differences between Alaska Native and white infants, though antibody rise was suboptimal in some Alaska Native infants.
Area of Science:
- Immunology
- Vaccinology
- Pediatrics
Background:
- Alaska Native infants are at high risk for invasive Haemophilus influenzae type b (Hib) disease.
- Evaluating vaccine efficacy in diverse populations is crucial for public health.
- Previous studies indicated potential differences in immune responses across ethnic groups.
Purpose of the Study:
- To compare the immunogenicity of two Haemophilus influenzae type b (Hib) conjugate vaccines (PRP-pertussis and PRP-D) in Alaska Native infants versus white infants.
- To assess antibody responses following a standard infant immunization schedule.
- To investigate factors influencing vaccine response in Alaska Native infants.
Main Methods:
- A comparative study involving Alaska Native infants and white infants from California and New York.
- Infants received either PRP-pertussis or PRP-D conjugate vaccines at two, four, and six months of age.
- Antibody levels were measured at various time points to assess immune response.
Main Results:
- No significant differences in antibody levels were observed between Alaska Native and white infants for the PRP-pertussis vaccine.
- Only 50% of infants achieved a twofold or greater antibody rise after three doses of the PRP-pertussis vaccine.
- While initial antibody levels were higher in Alaska Native infants for the PRP-D vaccine, no significant differences were found after immunization.
- No significant differences in antibody response were found based on ethnic purity among Alaska Native infants.
Conclusions:
- Both PRP-pertussis and PRP-D conjugate vaccines elicit comparable antibody responses in Alaska Native and white infants.
- Suboptimal antibody rise in a portion of Alaska Native infants warrants further investigation for Hib disease prevention strategies.
- Vaccine efficacy appears consistent across different ethnic backgrounds in this study population.
Abstract:
To evaluate immune responses in Alaska Native infants at high risk for invasive Haemophilus influenzae type b (Hib) disease, we studied PRP-pertussis and PRP-D conjugate vaccines in this population relative to responses in white infants in California and New York. Infants were immunized at two, four, and six months of age (both vaccines). In the PRP-pertussis trial, there were no significant differences in antibody levels at any age between Alaska Native infants and infants from California. Only 50% of the infants had a twofold or greater antibody rise after three doses. In the PRP-D trial, antibody levels at two months of age (presumably maternally acquired) were significantly higher for Alaska Native infants compared with infants from New York (P = .002). There were no significant differences in antibody levels after any of the three doses. Among Alaska Native infants there was no significant difference in antibody response based upon degree of ethnic purity.