Development and analytical validation of an immunoassay for quantifying serum anti-pertussis toxin antibodies resulting from Bordetella pertussis infection.
Adequately sensitive and specific methods to diagnose pertussis in adolescents and adults are not widely available. Currently, no Food and Drug Administration-approved diagnostic assays are available for the serodiagnosis of Bordetella pertussis. Since concentrations of B. pertussis-specific antibodies tend to be high during the later phases of disease, a simple, rapid, easily transferable serodiagnostic test was developed. This article describes test development, initial evaluation of a prototype kit enzyme-linked immunosorbent assay (ELISA) in an interlaboratory collaborative study, and analytical validation. The data presented here demonstrate that the kit met all prespecified criteria for precision, linearity, and accuracy for samples with anti-pertussis toxin (PT) immunoglobulin G (IgG) antibody concentrations in the range of 50 to 150 ELISA units (EU)/ml, the range believed to be most relevant for serodiagnosis. The assay met the precision and linearity criteria for a wider range, namely, from 50 to 200 EU/ml; however, the accuracy criterion was not met at 200 EU/ml. When the newly adopted World Health Organization International Standard for pertussis antiserum (human) reference reagent was used to evaluate accuracy, the accuracy criteria were met from 50 to 200 international units/ml. In conclusion, the IgG anti-PT ELISA met all assay validation parameters within the range considered most relevant for serodiagnosis. This ELISA was developed and analytically validated as a user-friendly kit that can be used in both qualitative and quantitative formats. The technology for producing the kit is transferable to public health laboratories.
Menzies
Sandra L
SL
Division of Bacterial, Parasitic, and Allergenic Products, Center for Biologics Evaluation and Research, FDA, Rockville, Maryland, USA. Sandra.Menzies@fda.hhs.gov
Kadwad
Vijay
V
Pawloski
Lucia C
LC
Lin
Tsai-Lien
TL
Baughman
Andrew L
AL
Martin
Monte
M
Tondella
Maria Lucia C
ML
Meade
Bruce D
BD
D000907:Antibodies, Bacterial / Q000097:blood*; D001886:Bordetella pertussis / Q000302:isolation & purification*; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D037342:Pertussis Toxin / Q000276:immunology*; D011933:Reagent Kits, Diagnostic; D012015:Reference Standards; D014917:Whooping Cough / Q000175:diagnosis* / Q000276:immunology
D000907:Antibodies, Bacterial; D007074:Immunoglobulin G; D011933:Reagent Kits, Diagnostic; D037342:Pertussis Toxin