Prevalence and Risk Factors for Staphylococcus Aureus Nasopharyngeal Carriage During a PCV Trial

Overview

Journal BMC Infect Dis

Publisher Biomed Central

Specialty Infectious Diseases

Date 2017 Aug 27

PMID 28841852

Citations 5

Authors

Abdoulie Bojang

Lindsay Kendall

Effua Usuf

Uzochukwu Egere

Sarah Mulwa

Martin Antonio

Brian Greenwood

Philip C Hill

Anna Roca

Affiliations

Soon will be listed here.

Abstract

Background: We conducted an ancillary study among individuals who had participated in a cluster-randomized PCV-7 trial in rural Gambia (some clusters were wholly-vaccinated while in others only young children had been vaccinated), to determine the prevalence and risk factors for Staphylococcus aureus nasopharyngeal carriage.

Methods: Two hundred thirty-two children aged 5-10 years were recruited and followed from 4 to 20 months after vaccination started. We collected 1264 nasopharyngeal swabs (NPS). S. aureus was isolated following conventional microbiological methods. Risk factors for carriage were assessed by logistic regression.

Results: Prevalence of S. aureus carriage was 25.9%. In the univariable analysis, prevalence of S. aureus carriage was higher among children living in villages wholly-vaccinated with PCV-7 [OR = 1.57 95%CI (1.14 to 2.15)] and children with least 1 year of education [OR = 1.44 95%CI (1.07 to 1.92)]. S. aureus carriage was also higher during the rainy season [OR = 1.59 95%CI (1.20 to 2.11)]. Carriage of S. pneumoniae did not have any effect on S. aureus carriage for any pneumococcal, vaccine-type (VT) or non-vaccine-type (NVT) carriage. Multivariate analysis showed that the higher prevalence of S. aureus observed among children living in villages wholly-vaccinated with PCV-7 occurred only during the rainy season OR 2.72 95%CI (1.61-4.60) and not in the dry season OR 1.28 95%CI (0.78-2.09).

Conclusions: Prevalence of nasopharyngeal carriage of S. aureus among Gambian children increased during the rainy season among those children living in PCV-7 wholly vaccinated communities. However, carriage of S. aureus is not associated with carriage of S. pneumoniae.

Trial Registration: ISRCTN51695599 . Registered August 04th 2006.

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