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Journal of Clinical Microbiology, November 2008, p. 3621-3625, Vol. 46, No. 11
0095-1137/08/$08.00+0     doi:10.1128/JCM.01245-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Cross-Sectional Study of Nasopharyngeal Carriage of Streptococcus pneumoniae in Human Immunodeficiency Virus-Infected Adults in the Conjugate Vaccine Era {triangledown}

Chinwendu Onwubiko,1 Edwin Swiatlo,1,2 and Larry S. McDaniel1,2,3*

Departments of Microbiology,1 Medicine,2 Surgery, University of Mississippi Medical Center, Jackson, Mississippi 392163

Received 1 July 2008/ Returned for modification 21 August 2008/ Accepted 12 September 2008

Human immunodeficiency virus (HIV)-infected patients have an increased rate of pneumococcal infections. Within the HIV-infected population, patients with low CD4+ cell counts have a higher rate of pneumococcal infection. The purpose of our study was to determine pneumococcal carriage and to examine the serotypes carried by HIV-infected patients after the introduction of the conjugate vaccine. Nasopharyngeal swabs were obtained from patients during routine clinic visits. Samples were cultured on blood agar plates with gentamicin and screened for alpha-hemolysis, optochin sensitivity, and bile solubility. Capsular serotypes were determined by multiplex PCR, multibead assay, or latex agglutination. Antibiotic susceptibility was determined by the Etest method. Multilocus sequence typing was also performed. Of the 175 patients enrolled, 120 patients had absolute CD4+ cell counts above 200/mm3 and 55 had counts below 200/mm3. A total of six (3.4%) patients carried pneumococci. All but one of these patients had received the 23-valent pneumococcal vaccine within the previous 5 years. Five of the isolates were serotypes that are not included in the 7-valent conjugate vaccine. Immunization with the pneumococcal polysaccharide vaccine does not prevent colonization in HIV-infected patients; however, the observation of carriage of serotypes not included in the conjugate vaccine may be due to herd immunity and serotype replacement effects in the general population.

* Corresponding author. Mailing address: Department of Microbiology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS 39216. Phone: (601) 984-6880. Fax: (601) 984-1708. E-mail: lmcdaniel{at}microbio.umsmed.edu

{triangledown} Published ahead of print on 24 September 2008.

Journal of Clinical Microbiology, November 2008, p. 3621-3625, Vol. 46, No. 11
0095-1137/08/$08.00+0     doi:10.1128/JCM.01245-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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