title: Post hoc analysis of a randomized double-blind trial of the correlation of functional and binding antibody responses elicited by 13-valent and 7-valent pneumococcal conjugate vaccines and association with nasopharyngeal colonization.
abstract: In a randomized double-blind trial in healthy Israeli infants in Israel who received the 13-valent or 7-valent pneumococcal conjugate vaccine (PCV13 or PCV7, respectively) at 2, 4, 6, and 12 months, PCV13 significantly reduced nasopharyngeal (NP) colonization of serotypes 1, 6A, 7F, 19A, cross-reacting 6C, and the common PCV7 serotype 19F, from ages 7 to 24 months. No differences were observed between the vaccine groups for serotype 3 or for the remaining common PCV7 serotypes. For serotype 5, too few events were observed to draw an inference. Generally consistent with these findings, PCV13 elicited significantly higher enzyme-linked immunosorbent assay (ELISA) IgG-binding antibody responses than did PCV7 for the additional PCV13 serotypes 1, 3, 5, 6A, 7F, 19A, and for the common serotype 19F, with similar or lower responses for the remaining common serotypes. To further assess immunogenicity and colonization, we conducted a post hoc analysis of PCV13 functional antibody responses measured by opsonophagocytic activity (OPA) assays in a randomly selected subset of subjects. The pattern of functional antibody OPA responses elicited by PCV13 relative to PCV7 was similar to that of the ELISA anticapsular IgG-binding antibody responses described above. In addition, the OPA responses generally correlated positively with IgG responses for all 13 serotypes among the PCV13 recipients and for all 7 common serotypes and the additional serotype 6A but not for 19A or the other serotypes unique to PCV13 among the PCV7 recipients. This post hoc analysis supports an association between serum OPA functional and IgG-binding antibody levels, allowing for a transfer of inferred associations between IgG responses and NP colonization to OPA responses.
authors.affiliation: Pfizer Pharma GmbH, Berlin, Germany.
authors.forename: Christine
authors.initials: C
authors.lastname: Juergens
authors.affiliation: Pfizer Inc., Pearl River, New York, USA.
authors.forename: Scott
authors.initials: S
authors.lastname: Patterson
authors.affiliation: inVentiv Health Clinical, Princeton, New Jersey, USA.
authors.forename: James
authors.initials: J
authors.lastname: Trammel
authors.affiliation: Pediatric Infectious Disease Unit, Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
authors.forename: David
authors.initials: D
authors.lastname: Greenberg
authors.affiliation: Pediatric Infectious Disease Unit, Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel Department of Public Health, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
authors.forename: Noga
authors.initials: N
authors.lastname: Givon-Lavi
authors.affiliation: Pfizer Inc., Pearl River, New York, USA.
authors.forename: David
authors.initials: D
authors.lastname: Cooper
authors.affiliation: Pfizer Inc., Pearl River, New York, USA.
authors.forename: Alejandra
authors.initials: A
authors.lastname: Gurtman
authors.affiliation: Pfizer Inc., Pearl River, New York, USA.
authors.forename: William C
authors.initials: WC
authors.lastname: Gruber
authors.affiliation: Pfizer Inc., Pearl River, New York, USA.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Scott
authors.affiliation: Pediatric Infectious Disease Unit, Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel rdagan@bgu.ac.il.
authors.forename: Ron
authors.initials: R
authors.lastname: Dagan
mesh_terms: D000907:Antibodies, Bacterial / Q000097:blood*; D000917:Antibody Formation; D002353:Carrier State / Q000276:immunology / Q000517:prevention & control*; D004311:Double-Blind Method; D004797:Enzyme-Linked Immunosorbent Assay; D000069443:Heptavalent Pneumococcal Conjugate Vaccine; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007223:Infant; D007557:Israel; D008297:Male; D009305:Nasopharynx / Q000382:microbiology*; D009895:Opsonin Proteins / Q000097:blood; D010587:Phagocytosis; D011008:Pneumococcal Infections / Q000276:immunology / Q000517:prevention & control*; D022242:Pneumococcal Vaccines / Q000276:immunology*; D065288:Serogroup; D013296:Streptococcus pneumoniae / Q000145:classification / Q000302:isolation & purification*
chemical_list: C538862:13-valent pneumococcal vaccine; D000907:Antibodies, Bacterial; D000069443:Heptavalent Pneumococcal Conjugate Vaccine; D007074:Immunoglobulin G; D009895:Opsonin Proteins; D022242:Pneumococcal Vaccines