This study is to evaluate the safety, tolerability and immunogenicity of 13-valent pneumococcal Conjugate Vaccine in children with Sickle Cell Disease who have already been vaccinated with 23-valent polysaccharide vaccine. The study will measure the amount of antibodies (the proteins that fight off germs) produced by children with Sickle Cell Disease after they have been given the 13-valent pneumococcal vaccine between 6 and less than 18 years of age. They will be given the vaccination twice, each vaccination separated by approximately 6 months.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
158
2 doses of 13vPnC will be administered by intramuscular injection separated by approximately 6 months.
Pfizer Investigational Site
Birmingham, Alabama, United States
Pfizer Investigational Site
Louisville, Kentucky, United States
Geometric Mean Fold Rise (GMFR) in Serotype-Specific Pneumococcal Immunoglobulin G (IgG) From 1 Month After 13vPnC Dose 1 to 1 Month After 13vPnC Dose 2
GMFR for the 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, and 23F) from 1 month after 13vPnC Dose 1 to 1 month after 13vPnC Dose 2 were computed using the logarithmically transformed assay results. Confidence interval (CI) for GMFR were back transformations of a CI based on the Student t distribution for the mean logarithm of the mean fold rise. GMFRs were calculated using all participants with available data from both 1 month after 13vPnC Dose 1 and after 13vPnC Dose 2 blood draws. Here number of participants analyzed signifies the evaluable immunogenicity population and "N" signifies participants with a determinate IgG antibody concentration for the given serotype at both 1 Month After 13vPnC Dose 1 and 1 Month After 13vPnC Dose 2 blood draws. Participants may be represented in more than 1 category.
Time frame: 1 Month After 13vPnC Dose 1, 1 Month After 13vPnC Dose 2
Geometric Mean Fold Rise (GMFR) in Serotype-Specific Pneumococcal Immunoglobulin G (IgG) From Before 13vPnC Dose 1 to 1 Month After 13vPnC Dose 1
GMFR for the 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, and 23F) from before 13vPnC Dose 1 to 1 month after 13vPnC Dose 1 were computed using the logarithmically transformed assay results. CI for GMFR were back transformations of a CI based on the Student t distribution for the mean logarithm of the mean fold rise. GMFRs were calculated using all participants with available data from before 13vPnC Dose 1 and 1 month after 13vPnC Dose 1 blood draws. Here number of participants analyzed signifies the evaluable immunogenicity population and "N" signifies participants with determinate IgG antibody concentration for the given serotype at both the before 13vPnC Dose 1 and 1 month after 13vPnC Dose 1 blood draws. Participants may be represented in more than 1 category.
Time frame: Before 13vPnC Dose 1, 1 month after 13vPnC Dose 1
Geometric Mean Fold Rise (GMFR) in Serotype-Specific Pneumococcal Immunoglobulin G (IgG) From Before 13vPnC Dose 2 to 1 Month After 13vPnC Dose 2
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Pfizer Investigational Site
Louisville, Kentucky, United States
Pfizer Investigational Site
The Bronx, New York, United States
Pfizer Investigational Site
Nashville, Tennessee, United States
Pfizer Investigational Site
Cairo, Cairo Governorate, Egypt
Pfizer Investigational Site
Cairo, Cairo Governorate, Egypt
Pfizer Investigational Site
Paris, France
Pfizer Investigational Site
Orbassano (TO), Italy
Pfizer Investigational Site
Roma, Italy
...and 9 more locations
GMFR for the 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, and 23F) from before 13vPnC Dose 2 to 1 month after 13vPnC Dose 2 were computed using the logarithmically transformed assay results. CI for GMFR were back transformations of a CI based on the Student t distribution for the mean logarithm of the mean fold rise. GMFRs were calculated using all participants with available data from before 13vPnC Dose 2 and 1 month after 13vPnC Dose 2 blood draws. Here number of participants analyzed signifies the evaluable immunogenicity population and "N" signifies participants with determinate IgG antibody concentration for the given serotype at both the before 13vPnC Dose 2 and 1 month after 13vPnC Dose 2 blood draws. Participants may be represented in more than 1 category.
Time frame: Before 13vPnC Dose 2, 1 month after 13vPnC Dose 2
Ratio of Geometric Mean Fold Rise (GMFR) in Serotype-Specific Pneumococcal Immunoglobulin G (IgG) From 13vPnC Dose 1 to 13vPnC Dose 2
GMFR for the 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, and 23F) were computed using the logarithmically transformed assay results for Dose 1 (after Dose 1/before Dose 1) and for Dose 2 (after Dose 2/before Dose 2). CI for the ratio of GMFR (Dose 2/Dose 1) were back transformations of a CI based on the Student t distribution for the mean logarithm of the measures (Dose 2 - Dose 1). Here number of participants analyzed signifies the evaluable immunogenicity population and "N" signifies participants with determinate IgG antibody concentration for given serotype at before 13vPnC Dose 1, 1 month after 13vPnC Dose 1, before 13vPnC Dose 2 and 1 month after 13vPnC Dose 2 blood draws. Participants may be represented in more than 1 category.
Time frame: Before 13vPnC Dose 1, 1 month after 13vPnC Dose 1, before 13vPnC Dose 2, 1 month after 13vPnC Dose 2
Geometric Mean Concentration (GMC) for Serotype-Specific Pneumococcal Immunoglobulin G (IgG) Antibody
Antibody GMC for the 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, and 23F) are presented. GMC (13vPnC) and corresponding 2-sided 95 percent (%) CIs were evaluated. Geometric means were calculated using all participants with available data for the specified blood draw. CI for GMC were back transformations of a CI based on the Student t distribution for the mean logarithm of the concentrations. Here number of participants analyzed signifies the evaluable immunogenicity population and "N" signifies participants with determinate IgG antibody concentration for the given serotype at specified time point. Participants may be represented in more than 1 category.
Time frame: Before 13vPnC Dose 1, 1 month after 13vPnC Dose 1, before 13vPnC Dose 2, 1 month after 13vPnC Dose 2
Geometric Mean Concentration (GMC) for Serotype-Specific Pneumococcal Immunoglobulin G (IgG) Antibody 1 Year After 13vPnC Dose 2
Antibody GMC for the 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, and 23F) are presented. GMC (13vPnC) and corresponding 2-sided 95 percent (%) CIs were evaluated. Geometric means were calculated using all participants with available data for the specified blood draw. CI for GMC were back transformations of a CI based on the Student t distribution for the mean logarithm of the concentrations. Here number of participants analyzed signifies the evaluable immunogenicity population at 1-year follow-up and "N" signifies participants with determinate IgG antibody concentration for the given serotype. Participants may be represented in more than 1 category.
Time frame: 1 year after 13vPnC Dose 2
Serotype-Specific Pneumococcal Opsonophagocytic Activity (OPA) Geometric Mean Titers (GMT)
Antibody GMTs as measured by OPA assay for 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, and 23F). GMT and corresponding 2-sided 95% CIs were evaluated. CIs for the GMTs are back transformations of a confidence interval based on the Student t distribution for the mean logarithm of the titers. GMTs were calculated using all participants with available data for the specified blood draw. Here number of participants analyzed signifies the evaluable immunogenicity population and "N" signifies participants with determinate OPA antibody titer for the given serotype at specified time point. Participants may be represented in more than 1 category.
Time frame: Before 13vPnC Dose 1, 1 month after 13vPnC Dose 1, before 13vPnC Dose 2, 1 month after 13vPnC Dose 2
Serotype-Specific Pneumococcal Opsonophagocytic Activity (OPA) Geometric Mean Titers (GMT) 1 Year After 13vPnC Dose 2
Antibody GMTs as measured by OPA assay for 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, and 23F). GMT and corresponding 2-sided 95% CIs were evaluated. CIs for the GMTs are back transformations of a confidence interval based on the Student t distribution for the mean logarithm of the titers. GMTs were calculated using all participants with available data for the specified blood draw. Here number of participants analyzed signifies the evaluable immunogenicity population at 1-year follow-up and "N" signifies participants with determinate OPA antibody titer for the given serotype. Participants may be represented in more than 1 category.
Time frame: 1 year after 13vPnC Dose 2