Oxacillin disk diffusion testing for the prediction of penicillin resistance in Streptococcus pneumoniae
ABSTRACT Objective To 1) describe the correlation between the zones of inhibition in 1-µg oxacillin disk diffusion (ODD) tests and penicillin and ceftriaxone minimum inhibitory concentrations (MICs) of meningeal and non-meningeal strains of Streptococcus pneumoniae and 2) evaluate the usefulness of...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Pan American Health Organization
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| Series: | Revista Panamericana de Salud Pública |
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| Online Access: | http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49892016000700057&lng=en&tlng=en |
| _version_ | 1819153730584444928 |
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| author | Gertrudis Horna María L. Molero Liliana Benites Sigri Roman Luz Carbajal Erik Mercado María E. Castillo Rito Zerpa Eduardo Chaparro Roger Hernandez Wilda Silva Francisco Campos Andy Saenz Isabel Reyes Alex Villalobos Theresa J. Ochoa |
| author_facet | Gertrudis Horna María L. Molero Liliana Benites Sigri Roman Luz Carbajal Erik Mercado María E. Castillo Rito Zerpa Eduardo Chaparro Roger Hernandez Wilda Silva Francisco Campos Andy Saenz Isabel Reyes Alex Villalobos Theresa J. Ochoa |
| author_sort | Gertrudis Horna |
| collection | DOAJ |
| description | ABSTRACT Objective To 1) describe the correlation between the zones of inhibition in 1-µg oxacillin disk diffusion (ODD) tests and penicillin and ceftriaxone minimum inhibitory concentrations (MICs) of meningeal and non-meningeal strains of Streptococcus pneumoniae and 2) evaluate the usefulness of the ODD test as a predictor of susceptibility to penicillin in S. pneumoniae and as a quick and cost-effective method easily implemented in a routine clinical laboratory setting. Methods S. pneumoniae isolates from healthy nasopharyngeal carriers less than 2 years old, obtained in a multicentric cross-sectional study conducted in various Peruvian hospitals and health centers from 2007 to 2009, were analyzed. Using Clinical and Laboratory Standards Institute (CLSI) breakpoints, the correlation between the zones of inhibition of the ODD test and the MICs of penicillin and ceftriaxone was determined. Results Of the 571 S. pneumoniae isolates, 314 (55%) showed resistance to penicillin (MIC ≥ 0.12 µg/mL) and 124 (21.7%) showed resistance to ceftriaxone (MIC ≥ 1 µg/mL). Comparison of the ODD test zones of inhibition and the penicillin MICs, using the CLSI meningeal breakpoints, showed good correlation (Cohen’s kappa coefficient = 0.8239). Conclusions There was good correlation between ODD zones of inhibition and penicillin meningeal breakpoints but weak correlation between the ODD results and non-meningeal breakpoints for both penicillin and ceftriaxone. Therefore, the ODD test appears to be a useful tool for predicting penicillin resistance in cases of meningeal strains of S. pneumoniae, particularly in low- and middle- income countries, where MIC determination is not routinely available. |
| first_indexed | 2024-12-22T15:09:45Z |
| format | Article |
| id | doaj.art-c37a5d03b5cc4e2682253ecbce13eacd |
| institution | Directory Open Access Journal |
| issn | 1680-5348 |
| language | English |
| last_indexed | 2024-12-22T15:09:45Z |
| publisher | Pan American Health Organization |
| record_format | Article |
| series | Revista Panamericana de Salud Pública |
| spelling | doaj.art-c37a5d03b5cc4e2682253ecbce13eacd2022-12-21T18:21:53ZengPan American Health OrganizationRevista Panamericana de Salud Pública1680-53484015763S1020-49892016000700057Oxacillin disk diffusion testing for the prediction of penicillin resistance in Streptococcus pneumoniaeGertrudis HornaMaría L. MoleroLiliana BenitesSigri RomanLuz CarbajalErik MercadoMaría E. CastilloRito ZerpaEduardo ChaparroRoger HernandezWilda SilvaFrancisco CamposAndy SaenzIsabel ReyesAlex VillalobosTheresa J. OchoaABSTRACT Objective To 1) describe the correlation between the zones of inhibition in 1-µg oxacillin disk diffusion (ODD) tests and penicillin and ceftriaxone minimum inhibitory concentrations (MICs) of meningeal and non-meningeal strains of Streptococcus pneumoniae and 2) evaluate the usefulness of the ODD test as a predictor of susceptibility to penicillin in S. pneumoniae and as a quick and cost-effective method easily implemented in a routine clinical laboratory setting. Methods S. pneumoniae isolates from healthy nasopharyngeal carriers less than 2 years old, obtained in a multicentric cross-sectional study conducted in various Peruvian hospitals and health centers from 2007 to 2009, were analyzed. Using Clinical and Laboratory Standards Institute (CLSI) breakpoints, the correlation between the zones of inhibition of the ODD test and the MICs of penicillin and ceftriaxone was determined. Results Of the 571 S. pneumoniae isolates, 314 (55%) showed resistance to penicillin (MIC ≥ 0.12 µg/mL) and 124 (21.7%) showed resistance to ceftriaxone (MIC ≥ 1 µg/mL). Comparison of the ODD test zones of inhibition and the penicillin MICs, using the CLSI meningeal breakpoints, showed good correlation (Cohen’s kappa coefficient = 0.8239). Conclusions There was good correlation between ODD zones of inhibition and penicillin meningeal breakpoints but weak correlation between the ODD results and non-meningeal breakpoints for both penicillin and ceftriaxone. Therefore, the ODD test appears to be a useful tool for predicting penicillin resistance in cases of meningeal strains of S. pneumoniae, particularly in low- and middle- income countries, where MIC determination is not routinely available.http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49892016000700057&lng=en&tlng=enStreptococcus pneumoniaeoxacillinPeruLatin America |
| spellingShingle | Gertrudis Horna María L. Molero Liliana Benites Sigri Roman Luz Carbajal Erik Mercado María E. Castillo Rito Zerpa Eduardo Chaparro Roger Hernandez Wilda Silva Francisco Campos Andy Saenz Isabel Reyes Alex Villalobos Theresa J. Ochoa Oxacillin disk diffusion testing for the prediction of penicillin resistance in Streptococcus pneumoniae Revista Panamericana de Salud Pública Streptococcus pneumoniae oxacillin Peru Latin America |
| title | Oxacillin disk diffusion testing for the prediction of penicillin resistance in Streptococcus pneumoniae |
| title_full | Oxacillin disk diffusion testing for the prediction of penicillin resistance in Streptococcus pneumoniae |
| title_fullStr | Oxacillin disk diffusion testing for the prediction of penicillin resistance in Streptococcus pneumoniae |
| title_full_unstemmed | Oxacillin disk diffusion testing for the prediction of penicillin resistance in Streptococcus pneumoniae |
| title_short | Oxacillin disk diffusion testing for the prediction of penicillin resistance in Streptococcus pneumoniae |
| title_sort | oxacillin disk diffusion testing for the prediction of penicillin resistance in streptococcus pneumoniae |
| topic | Streptococcus pneumoniae oxacillin Peru Latin America |
| url | http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49892016000700057&lng=en&tlng=en |
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