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Safety of the recombinant cholera toxin B subunit, killed whole-cell (rBS-WC) oral cholera vaccine in pregnancy

Hashim, R. and Khatib, A. M. and Enwere, G. and Park, J. K. and Reyburn, R. and Ali, M. and Chang, N. Y. and Kim, D. R. and Ley, B. and Thriemer, K. and Lopez, A. L. and Clemens, J. D. and Deen, J. L. and Shin, S. and Schaetti, C. and Hutubessy, R. and Aguado, M. T. and Kieny, M. P. and Sack, D. and Obaro, S. and Shaame, A. J. and Ali, S. M. and Saleh, A. A. and von Seidlein, L. and Jiddawi, M. S.. (2012) Safety of the recombinant cholera toxin B subunit, killed whole-cell (rBS-WC) oral cholera vaccine in pregnancy. PLoS neglected tropical diseases, Vol. 6, H. 7 , e1743.

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Official URL: http://edoc.unibas.ch/dok/A6094354

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Abstract

INTRODUCTION: Mass vaccinations are a main strategy in the deployment of oral cholera vaccines. Campaigns avoid giving vaccine to pregnant women because of the absence of safety data of the killed whole-cell oral cholera (rBS-WC) vaccine. Balancing this concern is the known higher risk of cholera and of complications of pregnancy should cholera occur in these women, as well as the lack of expected adverse events from a killed oral bacterial vaccine. METHODOLOGY/PRINCIPAL FINDINGS: From January to February 2009, a mass rBS-WC vaccination campaign of persons over two years of age was conducted in an urban and a rural area (population 51,151) in Zanzibar. Pregnant women were advised not to participate in the campaign. More than nine months after the last dose of the vaccine was administered, we visited all women between 15 and 50 years of age living in the study area. The outcome of pregnancies that were inadvertently exposed to at least one oral cholera vaccine dose and those that were not exposed was evaluated. 13,736 (94%) of the target women in the study site were interviewed. 1,151 (79%) of the 1,453 deliveries in 2009 occurred during the period when foetal exposure to the vaccine could have occurred. 955 (83%) out of these 1,151 mothers had not been vaccinated; the remaining 196 (17%) mothers had received at least one dose of the oral cholera vaccine. There were no statistically significant differences in the odds ratios for birth outcomes among the exposed and unexposed pregnancies. CONCLUSIONS/SIGNIFICANCE: We found no statistically significant evidence of a harmful effect of gestational exposure to the rBS-WC vaccine. These findings, along with the absence of a rational basis for expecting a risk from this killed oral bacterial vaccine, are reassuring but the study had insufficient power to detect infrequent events. TRIAL REGISTRATION: ClinicalTrials.gov NCT00709410
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Department of Epidemiology and Public Health (EPH) > Society, Gender and Health
UniBasel Contributors:Schaetti, Christian
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Public Library of Science
ISSN:1935-2727
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:31 Dec 2015 10:53
Deposited On:16 Aug 2013 07:28

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