Genetic stability of pneumococcal isolates during 35 days of human experimental carriage

Gladstone, R.A., Gritzfeld, Jenna, Coupland, P., Gordon, Stephen ORCID: https://orcid.org/0000-0001-6576-1116 and Bentley, S.D. (2015) 'Genetic stability of pneumococcal isolates during 35 days of human experimental carriage'. Vaccine, Vol 33, Issue 29, pp. 3342-3345.

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Abstract

Background

Pneumococcal carriage is a reservoir for transmission and a precursor to pneumococcal disease. The experimental human pneumococcal carriage model provides a useful tool to aid vaccine licensure through the measurement of vaccine efficacy against carriage (VEcol). Documentation of the genetic stability of the experimental human pneumococcal carriage model is important to further strengthen confidence in its safety and conclusions, enabling it to further facilitate vaccine licensure through providing evidence of VEcol.

Methods

229 isolates were sequenced from 10 volunteers in whom experimental human pneumococcal carriage was established, sampled over a period of 35 days. Multiple isolates from within a single volunteer at a single time provided a deep resolution for detecting variation. HiSeq data from the isolates were mapped against a PacBio reference of the inoculum to call variable sites.

Results

The observed variation between experimental carriage isolates was minimal with the maximum SNP distance between any isolate and the reference being 3 SNPs.

Conclusion

The low-level variation described provides evidence for the stability of the experimental human pneumococcal carriage model over 35 days, which can be reliably and confidently used to measure VEcol and aid future progression of pneumococcal vaccination.

Item Type:	Article
Subjects:	QW Microbiology and Immunology > Immunotherapy and Hypersensitivity > QW 805 Vaccines. Antitoxins. Toxoids QW Microbiology and Immunology > Immunotherapy and Hypersensitivity > QW 806 Vaccination WC Communicable Diseases > WC 20 Research (General) WC Communicable Diseases > Infection. Bacterial Infections > Bacterial Infections > WC 217 Pneumococcal infections
Faculty: Department:	Clinical Sciences & International Health > Clinical Sciences Department
Digital Object Identifer (DOI):	https://doi.org/10.1016/j.vaccine.2015.05.021
Depositing User:	Lynn Roberts-Maloney
Date Deposited:	28 Oct 2015 09:22
Last Modified:	07 Oct 2019 08:24
URI:	https://archive.lstmed.ac.uk/id/eprint/5380

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