Evaluation and Optimization of an ELISA Procedure to Quantify Antibodies Against Pneumococcal Polysaccharides Included in the 13-Valent Conjugate Vaccine.
The 13-valent pneumococcal conjugate vaccine (PCV-13) is recommended for HIV-infected people, although its effectiveness in this population remains under evaluation. In this study, we describe the development, optimization, and analytical validation of an ELISA procedure to measure specific antibodies for the pneumococcal polysaccharide serotypes included in PCV13 vaccine, testing sera obtained from HIV-infected outpatients (n = 30) who received the vaccine. The protocol followed the last version of WHO guidelines, based on the new standard 007sp, with the modification of employing Statens Serum Institut (SSI) antigens. We supplied the assay performance validation in terms of sensitivity, reproducibility, precision and accuracy. In addition we detailed optimal antigen-coating concentrations and ELISA conditions common to all 13 serotypes, suitable for laboratories performing these assays in order to standardize the method. Our procedure showed reproducibility and reliability, making it a valid alternative for evaluating the response to pneumococcal serotypes included in PCV13 vaccine.
a Institute of Clinical Infectious Diseases , Catholic University of the Sacred Heart , Rome , Italy.
Simone
S
Belmonti
a Institute of Clinical Infectious Diseases , Catholic University of the Sacred Heart , Rome , Italy.
Francesca
F
Lombardi
b Department of Medical Biotechnologies , University of Siena , Siena , Italy.
Matteo
M
Morandi
a Institute of Clinical Infectious Diseases , Catholic University of the Sacred Heart , Rome , Italy.
Massimiliano
M
Fabbiani
b Department of Medical Biotechnologies , University of Siena , Siena , Italy.
Giacinta
G
Tordini
a Institute of Clinical Infectious Diseases , Catholic University of the Sacred Heart , Rome , Italy.
Roberto
R
Cauda
b Department of Medical Biotechnologies , University of Siena , Siena , Italy.
Andrea
A
De Luca
a Institute of Clinical Infectious Diseases , Catholic University of the Sacred Heart , Rome , Italy.
Simona
S
Di Giambenedetto
b Department of Medical Biotechnologies , University of Siena , Siena , Italy.|c Hospital Department of Specialized and Internal Medicine , University Division of Infectious Diseases , Siena , Italy.
Francesca
F
Montagnani
D000907:Antibodies, Bacterial / Q000097:blood / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods / Q000592:standards; D005260:Female; D015658:HIV Infections / Q000097:blood / Q000276:immunology; D006801:Humans; D008297:Male; D022242:Pneumococcal Vaccines / Q000008:administration & dosage / Q000276:immunology*; D011135:Polysaccharides, Bacterial / Q000008:administration & dosage / Q000276:immunology*; D012680:Sensitivity and Specificity
D000907:Antibodies, Bacterial; D022242:Pneumococcal Vaccines; D011135:Polysaccharides, Bacterial
13-valent pneumococcal conjugate vaccine; ELISA; HIV infection; SSI pneumococcal antigens