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We determined the immunogenicity of conjugated Haemophilus influenzae type b and pneumococcal vaccines by quantitative analysis of the antibody response in asplenic patients. To that end, we vaccinated 92 patients with a conjugated Hib vaccine and 54 received two doses of conjugated pneumococcal vaccine (PCV7), followed at six months by a plain polysaccharide pneumococcal vaccine (PPV23). Antibody concentrations were measured before and three weeks after vaccination. After one dose of pneumococcal conjugate vaccine, 46% of the patients reached the antibody threshold of ≥ 1.0 μg/mL for all 7 tested vaccine serotypes. This percentage rose to 54% after the second dose of PCV7 and did not increase further after PPV23. Over 90% of patients had antibody concentrations ≥ 1.0 μg/mL for at least 5 out of the 7 conjugated pneumococcal serotypes after 2 doses of PCV7. For serotypes, included in the PPV23 vaccine only, 25% (PPS3)-100% (PPS19A) of the patients reached antibody concentrations ≥ 1.0 μg/mL after one dose of PPV23. For Hib, 97% of the patients reached the threshold concentration of ≥ 1.0 μg/mL after one dose of vaccine. It can be concluded that the majority of asplenic patients had a sufficient response to conjugated vaccines against Streptococcus pneumoniae and Hib, reflected by a ≥ 1.0 μg/mL antibody response. Inclusion of conjugated pneumococcal polysaccharide vaccines might be of additional value in the vaccination schedule for asplenic patients because of their high immunogenicity.
Department of Internal Medicine, St. Antonius Hospital Nieuwegein, The Netherlands. email@example.com
This article was published in the following journal.
Immunogenicity and safety of a fully liquid aluminum phosphate adjuvanted Haemophilus influenzae type b PRP-CRM197-conjugate vaccine in healthy Japanese children: A phase III, randomized, observer-blind, multicenter, parallel-group study.
Broad use of monovalent Haemophilus influenzae type b (Hib) conjugate vaccines based on the capsular polysaccharide polyribosyl-ribitol phosphate (PRP), has significantly reduced invasive Hib disease ...
In addition to reducing Haemophilus influenzae type b (Hib) disease in vaccinated individuals, the Hib conjugate vaccine (HibCV) has indirect effects; it reduces Hib disease in unvaccinated individual...
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Bacterial meningitis remains an important infection globally, with the greatest burden in children in low-income settings, including Papua New Guinea (PNG). We present serotype, antimicrobial suscepti...
Antibody persistence is evaluated in healthy Australian children four and five years post-vaccination with a single dose of combined Haemophilus influenzae type b - Neisseria meningitidis serogroup C ...
Haemophilus influenzae b (Hib) is responsible for meningitis, systemic infections and acute respiratory illness, especially in children. The use of the conjugate vaccines against Hib reduced the incid...
This study will evaluate the safety and immunogenicity of booster doses of the two vaccines used to prevent Haemophilus influenzae type b infections in children 12-18 months of age.
Haemophilus influenza type b (Hib) remains a serious global health threat associated with high mortality and morbidity in young children. In China, The overall impact of Hib-related infect...
Study in Infants (6-12 Months) Comparing Two Doses of a Monovalent Glycoprotein-Conjugated (Diptheria Toxin -CRM197) Vaccine Versus a Tetanus Toxoid-Conjugated Vaccine Available for the Prevention of Haemophilus Influenzae Type b Infections in China
This study will evaluate the safety and efficacy of two doses of two commercially available vaccines used to prevent Haemophilus influenzae type b infections in children 6-12 months of ag...
This study will evaluate the safety and immunogenicity of single dose of two commercially available vaccines used to prevent Haemophilus influenzae type b infections in children 13-59 mon...
The study will evaluate the safety and immunogenicity of a haemophilus influenzae type b conjugate vaccine (Hib) in Healthy Children 2 Months to 5 Years of Age who have not been previously...
Vaccines or candidate vaccines containing antigenic polysaccharides from Haemophilus influenzae and designed to prevent infection. The vaccine can contain the polysaccharides alone or more frequently polysaccharides conjugated to carrier molecules. It is also seen as a combined vaccine with diphtheria-tetanus-pertussis vaccine.
A type of H. influenzae isolated most frequently from biotype I. Prior to vaccine availability, it was a leading cause of childhood meningitis.
Semisynthetic vaccines consisting of polysaccharide antigens from microorganisms attached to protein carrier molecules. The carrier protein is recognized by macrophages and T-cells thus enhancing immunity. Conjugate vaccines induce antibody formation in people not responsive to polysaccharide alone, induce higher levels of antibody, and show a booster response on repeated injection.
Vaccines or candidate vaccines used to prevent infections with STREPTOCOCCUS PNEUMONIAE.
A species of HAEMOPHILUS found on the mucous membranes of humans and a variety of animals. The species is further divided into biotypes I through VIII.
A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened or killed forms of the microbe, its toxins or one ...