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Evidence of Extended Thermo-Stability of Typhoid Polysaccharide Conjugate Vaccines
Typhoid conjugate vaccines (TCV) are effective in preventing enteric fever caused by Salmonella enterica serovar Typhi in Southeast Asia and Africa. To facilitate vaccination with the Vi capsular polysaccharide–tetanus toxoid conjugate vaccine, Typbar TCV, and allow it to be transported and stored o...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8400138/ https://www.ncbi.nlm.nih.gov/pubmed/34442786 http://dx.doi.org/10.3390/microorganisms9081707 |
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author | Gao, Fang Lockyer, Kay Logan, Alastair Davis, Sarah Bolgiano, Barbara Rijpkema, Sjoerd Singh, Gopal Prasad, Sai D. Dondapati, Samuel Pradeep Sounkhla, Gurbaksh Singh |
author_facet | Gao, Fang Lockyer, Kay Logan, Alastair Davis, Sarah Bolgiano, Barbara Rijpkema, Sjoerd Singh, Gopal Prasad, Sai D. Dondapati, Samuel Pradeep Sounkhla, Gurbaksh Singh |
author_sort | Gao, Fang |
collection | PubMed |
description | Typhoid conjugate vaccines (TCV) are effective in preventing enteric fever caused by Salmonella enterica serovar Typhi in Southeast Asia and Africa. To facilitate vaccination with the Vi capsular polysaccharide–tetanus toxoid conjugate vaccine, Typbar TCV, and allow it to be transported and stored outside a cold chain just prior to administration, an extended controlled-temperature conditions (ECTC) study was performed to confirm the quality of the vaccine at 40 °C for 3 days at the end of its shelf-life (36 months at 2–8 °C). Studies performed in parallel by the vaccine manufacturer, Bharat Biotech International Limited, and an independent national control laboratory (NIBSC) monitored its stability-indicating parameters: O-acetylation of the Vi polysaccharide, integrity of the polysaccharide–protein conjugate, and its molecular size and pH. ECTC samples stored at 40 °C and 45 °C in comparison with control samples stored at 4 °C and 55 or 56 °C, were shown to have stable O-acetylation and pH; only very slight increases in the percentage of free saccharide and corresponding decreases in molecular size were observed. The deoxycholate method for precipitating conjugated polysaccharide was very sensitive to small incremental increases in percentage of free saccharide, in line with storage temperature and duration. This extended ECTC study demonstrated minimal structural changes to the Vi polysaccharide and conjugate vaccine and a stable formulation following extended exposure to elevated temperatures for the desired durations. This outcome supports the manufacturer’s ECTC claim for the vaccine to be allowed to be taken outside the cold chain before its administration. |
format | Online Article Text |
id | pubmed-8400138 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-84001382021-08-29 Evidence of Extended Thermo-Stability of Typhoid Polysaccharide Conjugate Vaccines Gao, Fang Lockyer, Kay Logan, Alastair Davis, Sarah Bolgiano, Barbara Rijpkema, Sjoerd Singh, Gopal Prasad, Sai D. Dondapati, Samuel Pradeep Sounkhla, Gurbaksh Singh Microorganisms Article Typhoid conjugate vaccines (TCV) are effective in preventing enteric fever caused by Salmonella enterica serovar Typhi in Southeast Asia and Africa. To facilitate vaccination with the Vi capsular polysaccharide–tetanus toxoid conjugate vaccine, Typbar TCV, and allow it to be transported and stored outside a cold chain just prior to administration, an extended controlled-temperature conditions (ECTC) study was performed to confirm the quality of the vaccine at 40 °C for 3 days at the end of its shelf-life (36 months at 2–8 °C). Studies performed in parallel by the vaccine manufacturer, Bharat Biotech International Limited, and an independent national control laboratory (NIBSC) monitored its stability-indicating parameters: O-acetylation of the Vi polysaccharide, integrity of the polysaccharide–protein conjugate, and its molecular size and pH. ECTC samples stored at 40 °C and 45 °C in comparison with control samples stored at 4 °C and 55 or 56 °C, were shown to have stable O-acetylation and pH; only very slight increases in the percentage of free saccharide and corresponding decreases in molecular size were observed. The deoxycholate method for precipitating conjugated polysaccharide was very sensitive to small incremental increases in percentage of free saccharide, in line with storage temperature and duration. This extended ECTC study demonstrated minimal structural changes to the Vi polysaccharide and conjugate vaccine and a stable formulation following extended exposure to elevated temperatures for the desired durations. This outcome supports the manufacturer’s ECTC claim for the vaccine to be allowed to be taken outside the cold chain before its administration. MDPI 2021-08-11 /pmc/articles/PMC8400138/ /pubmed/34442786 http://dx.doi.org/10.3390/microorganisms9081707 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Gao, Fang Lockyer, Kay Logan, Alastair Davis, Sarah Bolgiano, Barbara Rijpkema, Sjoerd Singh, Gopal Prasad, Sai D. Dondapati, Samuel Pradeep Sounkhla, Gurbaksh Singh Evidence of Extended Thermo-Stability of Typhoid Polysaccharide Conjugate Vaccines |
title | Evidence of Extended Thermo-Stability of Typhoid Polysaccharide Conjugate Vaccines |
title_full | Evidence of Extended Thermo-Stability of Typhoid Polysaccharide Conjugate Vaccines |
title_fullStr | Evidence of Extended Thermo-Stability of Typhoid Polysaccharide Conjugate Vaccines |
title_full_unstemmed | Evidence of Extended Thermo-Stability of Typhoid Polysaccharide Conjugate Vaccines |
title_short | Evidence of Extended Thermo-Stability of Typhoid Polysaccharide Conjugate Vaccines |
title_sort | evidence of extended thermo-stability of typhoid polysaccharide conjugate vaccines |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8400138/ https://www.ncbi.nlm.nih.gov/pubmed/34442786 http://dx.doi.org/10.3390/microorganisms9081707 |
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