A prospective, two center study of 319 children was undertaken to assess responses to booster immunization in healthy 18-month-olds who completed primary immunization 12 months earlier with Haemophilus influenzae type b (Hib) conjugate vaccine (either HbOC or PRP-T). Interchangeability of these products as boosters was also assessed, using combination products containing diphtheria, pertussis and tetanus components. The study was randomized and evaluator blinded. Sera obtained prior to booster vaccination and 4 weeks later were tested for anti-PRP using an IgG-specific enzyme immunoassay. Pre-immunization anti-PRP levels were low: unmeasurable levels (< 0.06 microgram ml-1) were present in 47% of those primed with HbOC and 35% of those primed with PRP-T (P < 0.05). Most children responded strongly to booster vaccination. Interchanging the products had no detrimental effect. Children who lacked measurable antibody prior to re-vaccination had significantly weaker responses 4 weeks afterward. Earlier Hib booster vaccination should be considered in Canada to avoid low anti-PRP trough levels. Extended follow-up of antibody levels and vaccine protective efficacy is also advisable given the observed heterogeneity of responses to booster vaccination.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0264-410x(96)00086-2 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Long-Term Immunity and Anamnestic Response Following Hepatitis B Vaccination: A Systematic Review and Meta-Analysis.
J Viral Hepat
February 2025
Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, California, USA.
Using a systematic review and meta-analytic approach, this study determined the durability of HBV immunity and the prevalence of anamnestic response to a booster HBV vaccine dose in individuals previously vaccinated with a 3-dose HBV vaccine series as children or adolescents. Two researchers independently searched PubMed, Embase and Cochrane from inception to 6/1/2023 and performed data extraction. Studies that included individuals with significant comorbidities or < 5 years of follow-up were excluded.
View Article and Find Full Text PDFA Preliminary Study to Evaluate the Immune Response to a Booster Dose of the Adult Tetanus-Diphtheria Vaccine (Td) Available in Iran.
Iran J Pharm Res
September 2024
Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran.
Background: Despite the availability of tetanus-diphtheria (TD) vaccines in Iran, the seroconversion rate of these products as a booster dose is unknown.
Objectives: This study evaluates the seroconversion rate of the Iranian Td vaccine in adults who have not been vaccinated in the past decade.
Methods: In this study, 20 adult volunteers aged 18 to 60 who had not received the Td vaccine in the past decade received a booster dose of the Iranian Td vaccine.
S6P mutation in Delta and Omicron variant spike protein significantly enhances the efficacy of mRNA COVID-19 vaccines.
Front Immunol
January 2025
RNAimmune, Inc., Germantown, MD, United States.
Background: The unrelenting emergence of SARS-CoV-2 variants has significantly challenged the efficacy of existing COVID-19 vaccines. Enhancing the stability and immunogenicity of the spike protein is critical for improving vaccine performance and addressing variant-driven immune evasion.
Methods: We developed an mRNA-based vaccine, RV-1730, encoding the Delta variant spike protein with the S6P mutation to enhance stability and immunogenicity.
Proteins that selectively bind to a target of interest are foundational components of research pipelines , diagnostics , and therapeutics . Current immunization-based , display- based , and computational approaches for discovering binders are laborious and time- consuming - taking months or more, suffer from high false positives - necessitating extensive secondary screening, and have a high failure rate, especially for disordered proteins and other challenging target classes. Here we establish Phage-Assisted Non-Continuous Selection of Protein Binders (PANCS-binders), an selection platform that links the life cycle of M13 phage to target protein binding though customized proximity-dependent split RNA polymerase biosensors, allowing for complete and comprehensive high-throughput screening of billion-plus member protein variant libraries with high signal-to-noise.
View Article and Find Full Text PDFBeta-variant recombinant SARS CoV-2 vaccine induces durable cross-reactive antibodies against Omicron BA variants.
Commun Med (Lond)
January 2025
URC EST, Sorbonne Université, Paris, France.
Background: We previously reported the safety and immunogenicity data from a randomized trial comparing the booster responses of vaccinees who received monovalent (MV) recombinant protein Beta-variant (MVB.1.351) and MV ancestral protein (MVD614) vaccines with AS03 adjuvant (Sanofi/GSK) to booster response of vaccinees who received mRNA MV ancestral strain BNT162b2 vaccine (Pfizer-BioNTech).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!