Abstract
Measurement of pre- and post-pneumococcal antibody levels after immunization with the 23-valent capsular polysaccharide pneumococcal vaccine (23vPPV) is indicative of a T-independent antibody response. The World Health Organisation ELISA is considered gold standard yet is labor-intensive and technically difficult to perform. Interpretation criteria defining an adequate response to 23vPPV remain controversial. The diagnostic Immunology Laboratory at The Royal Children’s Hospital, Melbourne (RCH), performs an in-house multi-serotype automated ELISA. The primary objective of this study was to verify RCH interpretation criteria for the laboratory’s automated ELISA. Forty pneumococcal conjugate vaccine (PCV)–naïve healthy adults aged 18 to 25 years and 22 PCV-primed healthy children aged 2 to 5 years were immunized with 23vPPV. A serum sample was collected immediately prior and 28 to 42 (± 7) days post immunization. Samples were analyzed on the Tecan Freedom Evo 200 ELISA with adequate response defined as post-immunization antibody level of 1.3 µg/mL or fourfold rise from baseline in ≥ 10/15 serotypes in adult participants and ≥ 4/8 serotypes in pediatric participants. Thirty-nine (97.5%) adults and 22 (100%) children achieved an adequate response to 23vPPV. In PCV-naïve adults, serotypes contained within the conjugate vaccines were less immunogenic, with 12 (30%) adults not achieving an adequate antibody response when only PCV serotypes were used for interpretation. Our diagnostic laboratory has verified the interpretation criteria used for an automated multi-serotype pneumococcal ELISA method. Clinical Trial Registration: ANZCTR registration number ACTRN12618000822280.
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Data Availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
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Not applicable.
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Acknowledgements
We would like to thank Sonja Elia at RCH Immunisation Service for her support of this study.
Funding
This work was supported by The RCH Foundation.
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Authors and Affiliations
Contributions
Laine Hosking, Sharon Choo, Kirsten Perrett and Stephanie Richards contributed to study conception and design. Christine Czjako and Marilyn Clark designed the automated ELISA and Sinead Flynn performed the experiments. Laine Hosking analyzed the data. The first draft of the manuscript was written by Laine Hosking and Sharon Choo and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Ethics Approval
This study was performed in line with the Australian National Statement on Ethical Conduct in Human Research. Approval was granted by the Royal Children’s Hospital Human Research Ethics Committee (protocol number 37183).
Consent to Participate
Informed consent was obtained from all individual participants or their guardians included in the study.
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Not applicable, no individual data included in the manuscript.
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Appendices
Appendix
Appendix 1. Inclusion and exclusion criteria
Inclusion Criteria
Each adult must meet all of the following criteria to be enrolled in this study:
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Is between the ages of 18 and 25 years at the time of enrolment
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Is capable of understanding the informed consent document and providing consent
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Is available to attend the study follow-up
Each child must meet all of the following criteria to be enrolled in this study:
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Is between the ages of 2 and 5 years at the time of enrolment
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Has received Prevenar13 as per the Australian National Immunisation Program Schedule at 2-, 4-, and 6 months of age
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Has a legally acceptable representative capable of understanding the informed consent document and providing consent on the participant’s behalf
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Is available to attend the study follow-up
Exclusion criteria
Participants meeting any of the following criteria will be excluded from the study:
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Prior immunization with 23vPPV
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Has a known hypersensitivity to any of the components of the 23vPPV vaccine
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Has a current fever or infection
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Is taking immunosuppressant medication, e.g. oral corticosteroids
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Has a prior diagnosis of invasive pneumococcal infection
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Has a pre-existing medical condition associated with increased risk of invasive pneumococcal disease
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Is currently pregnant, or considering pregnancy during the study period
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Is known to require a pneumococcal immunization prior to the completion of the study follow-up
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Inability or unwillingness of participant or legally acceptable representative to give written informed consent
In addition, for adult participants, the following exclusion criteria apply:
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Prior immunization with a pneumococcal conjugate vaccine
Appendix 2
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Hosking, L.M., Perrett, K.P., Czajko, C. et al. Pneumococcal IgG Antibody Responses to 23vPPV in Healthy Controls Using an Automated ELISA. J Clin Immunol 42, 760–770 (2022). https://doi.org/10.1007/s10875-022-01230-8
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DOI: https://doi.org/10.1007/s10875-022-01230-8