Track topics on Twitter Track topics that are important to you
Two( 2) or three (3) instead of four vaccinations before the age of 6 months with pneumococcal conjugate vaccine are presumed to protect children against invasive pneumococcal disease like meningitis, at least on the short term till 18-24 months of age. The current hypothesis in this study is 2 or 3 vaccinations will protect against IPD but will not alter pneumococcal nasopharyngeal carriage in infants, and consequently not change pneumococcal transmission and induce no herd-immunity. Furthermore, antibody development and memory may benefit from carriage of vaccine type S. pneumoniae
Two(2 and 4 months) and three vaccinations (2,4 and 11 months) with 7-valent pneumococcal conjugate vaccine Prevnar in infants are presumed to provide about 90% protection against invasive pneumococcal disease (IPD) for vaccine type pneumococci, at least until 18-24 months of age. Licensure of the vaccine however is based on studies with 3 vaccinations before 6 months and a booster vaccination half a year later (3+1 scheme). Cost-effectiveness in national infant vaccination programs (NIPs)is much improved by high herd-immunity effects,as observed in the USA after licensure of Prevnar in 2000, both for IPD and AOM. However, overall pneumococcal carriage reduction (and nasopharyngeal replacement) has not been assessed in studies with reduced doses. With reduced carriage reduction, effects on respiratory tract infections and herd immunity may be significantly less.
The primary aim of the current study is to compare effect of 2-doses (at ages 2 and 4 months) with a 3-doses scheme(2+1, at 2, 4 and 11 months) on nasopharyngeal pneumococcal carriage and replacement and family transmission(sibs and caregivers), in order to allow modelling for herd-immunity.
The secondary aim is to determine the effect of a reduced doses scheme on serum antipneumococcal antibody levels at the age of 12 and 24 months.
A third aim is to determine antipneumococcal antibody levels and memory B-cell development after booster vaccination at 24 months of age, after 2 or 2+1 doses and compare these with a first vaccination at 24 months of age.
Opportunities are the determination of nasopharyngeal colonizing pneumococci in unvaccinated infants in the Netherlands before implementation of Prevnar in the NIP, evaluation of replacing pneumococci in the nasopharynx after vaccinations and analysis of effects on other colonizing bacteria like H.influenzae, M. catarrhalis and S.aureus. Furthermore, the relation between colonizing pneumococci and serotypes causing IPD in the Netherlands can be evaluated.
Methods : 1000 infants and families will be included in a randomized,controlled study with 3 interventions groups
1. Prevnar at 2 and 4 months
2. Prevnar at 2, 4 and 11 months
3. Prevnar at 24 months (controls)
The children will be followed until 2 years of age with nasopharyngeal swabs for bacterial culture before the first vaccination, at 6, 12, 18 and 24 months of age. One sibling and one parent/caregiver will be swabbed when the infant is 12 and 24 months. Blood for antibody determination will be obtained from 80 children of groups 1 and 2, and from 30 children in the control group. Questionnaires on health and respiratory infections and antibiotic prescription for RTI will be obtained.
At 24 months of age, all children of groups 1 and 2 will be offered a booster vaccination. Antibody levels will be measured before and 4 weeks after this vaccination at 2 years of age in a subset of 80 children per group and compared with 80 children who received a first vaccination at 24 months of age.
Allocation: Randomized, Control: Active Control, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label
Streptococcus Pneumoniae Infection
Prevnar ( vaccine), 7- valent pneumococcal conjugate vaccine Prevnar [Wyeth]
Active, not recruiting
Published on BioPortfolio: 2014-08-27T03:50:08-0400
We plan to study whether the 7-valent pneumococcal conjugate vaccine (Prevnar™) is safe and effective in protecting children who have had a solid organ transplantation and healthy childr...
The purpose of this study is to assess the "late" immune response to further doses of pneumococcal conjugate vaccine more than 10 years after primary immunization with Prevnar (7vPnC) in i...
This study is being conducted to evaluate the safety, tolerability, and immunogenicity of 15-valent Pneumococcal conjugate vaccine (V114) compared to Prevnar™ in healthy adults and toddl...
The trial will compare a group of patients whose immune system is primed with the pneumococcal conjugate vaccine and then given a boost with polysaccharide vaccine (prime-boost strategy) v...
The purpose of this study is to assess the safety, tolerability and immunogenicity of a 13-valent pneumococcal conjugate vaccine (13vPnC), relative to a 7-valent pneumococcal conjugate va...
Each year in China, approximately 700,000 children under 5 years old are diagnosed with pneumonia, and 30,000 die from the disease. Although 7-valent pneumococcal conjugate vaccine (PCV-7) and 23-vale...
Three years after a 7-valent pneumococcal conjugate vaccine was replaced by a 10-valent pneumococcal conjugate vaccine in the Netherlands, we observed a decrease in incidence of invasive pneumococcal ...
Immunogenicity and safety of 13-valent pneumococcal conjugate vaccine (PCV13) were compared with 7-valent PCV (PCV7) in Chinese infants.
High incidence and serotype diversity of invasive pneumococcal disease (IPD) in Indigenous children in remote Australia led to rapid introduction of 7-valent conjugate pneumococcal vaccine (7vPCV) at ...
Definition of the optimal pneumococcal vaccine strategy in HIV-infected adults is still under evaluation. We aimed to compare immunogenicity and safety of the 13-valent pneumococcal conjugate vaccine ...
A combined vaccine used to prevent infection with diphtheria and tetanus toxoid. This is used in place of DTP vaccine (DIPHTHERIA-TETANUS-PERTUSSIS VACCINE) when PERTUSSIS VACCINE is contraindicated.
A live vaccine containing attenuated poliovirus, types I, II, and III, grown in monkey kidney cell tissue culture, used for routine immunization of children against polio. This vaccine induces long-lasting intestinal and humoral immunity. Killed vaccine induces only humoral immunity. Oral poliovirus vaccine should not be administered to immunocompromised individuals or their household contacts. (Dorland, 28th ed)
A bacterial vaccine for the prevention of brucellosis in man and animal. Brucella abortus vaccine is used for the immunization of cattle, sheep, and goats.
A live attenuated virus vaccine of chick embryo origin, used for routine immunization of children and for immunization of adolescents and adults who have not had mumps or been immunized with live mumps vaccine. Children are usually immunized with measles-mumps-rubella combination vaccine.
A live attenuated virus vaccine of chick embryo origin, used for routine immunization of children and for immunization of adolescents and adults who have not had measles or been immunized with live measles vaccine and have no serum antibodies against measles. Children are usually immunized with measles-mumps-rubella combination vaccine. (From Dorland, 28th ed)
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 ...
Pediatrics is the general medicine of childhood. Because of the developmental processes (psychological and physical) of childhood, the involvement of parents, and the social management of conditions at home and at school, pediatrics is a specialty. With ...
An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Examples of antigens include microorganisms (such as bacteria, fungi, parasites, and viruses) and chemicals. Antibodies may be produc...