Impact of cotrimoxazole on non-susceptibility to antibiotics in Streptococcus pneumoniae carriage isolates among HIV-infected mineworkers in South Africa - 08/08/11
, S. Charalambous a, A. von Gottberg b, B. Magadla a, V. Moloi a, O. Seabi a, A. Wasas b, K.P. Klugman b, c, R.E. Chaisson d, K. Fielding e, G.J. Churchyard a, A.D. Grant e
Corresponding author at: P. O. Box 783155, Sandton 2146, South Africa. Tel.: +27 (0) 11 202 0500; fax: +27 (0) 11 202 0781.Summary |
Objectives |
To investigate risk factors for pneumococcal carriage and non-susceptibility among HIV-infected mineworkers in South Africa.
Methods |
In a cross-sectional study, HIV clinic attendees were questioned about risk factors for pneumococcal carriage and antimicrobial non-susceptibility. Oropharyngeal and nasopharyngeal swabs were taken for pneumococcal culture, serotyping and susceptibility testing.
Results |
Among 856 participants (854 male, median age 41.5years, median CD4 290cells/mm3), 294 (34.3%) were receiving cotrimoxazole prophylaxis. Overall, 75/856 (8.8%) carried S. pneumoniae; among those taking vs. not taking cotrimoxazole, 8.2% vs. 9.1% were carriers. Risk factors for pneumococcal carriage were living with a child (adjusted OR 2.12, 95% CI 1.06–4.62) and recent hospitalisation (adjusted OR 1.80; 95% CI 0.98–3.30). Among participants not taking cotrimoxazole, the prevalence of carriage was higher in individuals with lower CD4 counts. Comparing participants taking cotrimoxazole vs. not, 60.9% vs. 22.4% (p=0.001) isolates were non-susceptible to cotrimoxazole and 30.4% vs. 8.2% were non-susceptible to penicillin (p=0.014). Thirty three/72 (45.8%) isolates were paediatric serotypes/groups. Nasopharyngeal compared with oropharyngeal swabs had higher sensitivity in detecting carriage (53/75, 70.7% vs. 31/75, 41.3%), and adding oropharyngeal sampling increased detection from 6.2% to 8.8%.
Conclusions |
Non-susceptibility to cotrimoxazole and penicillin was more common among isolates from participants taking cotrimoxazole prophylaxis. Surveillance for antimicrobial susceptibility is important where prophylaxis is used. Treatment for pneumococcal disease should take into account a higher risk of non-susceptibility to antibiotics amongst individuals taking cotrimoxazole prophylaxis.
Le texte complet de cet article est disponible en PDF.Keywords : Pneumococcal carriage, HIV infection, Sub-Saharan Africa, Antimicrobial resistance
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Vol 56 - N° 3
P. 171-178 - mars 2008 Retour au numéro
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