Serum antibody response to five Streptococcus pneumoniae proteins during acute otitis media in otitis-prone and non-otitis-prone children.

Abstract

BACKGROUND:

Streptococcus pneumoniae (Spn) is one of the common bacteria responsible for episodic acute otitis media (AOM; non-otitis-prone), recurrent AOM (otitis-prone), and AOM treatment failure (AOMTF) in children.

OBJECTIVE:

From a population of 268 children, we sought to compare the serum IgG antibody titers of 5 different Spn proteins (PhtD, LytB, PcpA, PhtE, and Ply) that are vaccine candidates in children with episodic AOM (n = 34), who were otitis prone (n = 35) and who had AOMTF (n = 25) caused by Spn.

METHODS:

Antibody was quantitated by enzyme-linked immunosorbent assay.

RESULTS:

At their AOM visit, anti-PhtD, -LytB, -PhtE, and -Ply IgG antibody titers in otitis-prone children were significantly lower compared with non-otitis-prone children (P < 0.05) and children with AOMTF (P < 0.05). On comparing acute to convalescent geometric mean IgG antibody titers after AOM against the 5 proteins we found that otitis-prone, AOMTF, and non-otitis-prone children had no significant change in titers (except for PhtE in children with AOMTF), but detailed analysis showed that about one-third of the children in each cohort had a 2-fold rise in antibody to the studied antigens. Although non-otitis-prone children had significant increases (P < 0.001) between 6 and 24 months of age in anti-PhtD, PcpA, PhtE, and Ply IgG antibody titers as a consequence of nasopharyngeal colonization and AOM, otitis-prone children either failed to show rises or the rises were significantly less than the non-otitis-prone children.

CONCLUSION:

Otitis-prone and AOMTF children mount less of an IgG serum antibody response as compared with non-otitis-prone children to Spn proteins after AOM and nasopharyngeal colonization.

• Authors: Ravinder Kaur, Janet R Casey, Michael E Pichichero
• Journal: The Pediatric infectious disease journal (Pediatr Infect Dis J) Vol. 30 Issue 8 Pg. 645-50 (Aug 2011) ISSN: 1532-0987 [Electronic] United States
• PMID: 21487325 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Antibodies, Bacterial
• Antigens, Bacterial
• Bacterial Proteins
• Immunoglobulin G

Topics

• Antibodies, Bacterial (blood)
• Antigens, Bacterial (immunology)
• Bacterial Proteins (immunology)
• Child, Preschool
• Disease Susceptibility (immunology)
• Enzyme-Linked Immunosorbent Assay
• Humans
• Immunoglobulin G (blood)
• Infant
• Otitis Media (immunology, microbiology)
• Pneumococcal Infections (immunology, microbiology)
• Prospective Studies
• Serum (immunology)
• Streptococcus pneumoniae (immunology)