False penicillin resistance in Neisseria meningitidis following direct susceptibility tests from blood cultures
| Autor: | N C Weightman |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Penicillin Resistance
Short Report Microbial Sensitivity Tests Penicillins Neisseria meningitidis medicine.disease_cause Benzylpenicillin beta-Lactamases Pathology and Forensic Medicine Microbiology polycyclic compounds medicine Humans False Positive Reactions Agar diffusion test biology Inoculation Penicillin G General Medicine Middle Aged biology.organism_classification Virology Meningococcal Infections Penicillin Invasive meningococcal disease Penicillin resistance Female Bacteria medicine.drug |
| Zdroj: | Journal of Clinical Pathology. 54:893-895 |
| ISSN: | 0021-9746 |
| DOI: | 10.1136/jcp.54.11.893 |
| Popis: | Blood cultures drawn from a patient with clinically diagnosed invasive meningococcal disease, who had been previously administered benzylpenicillin, had s-lactamases added to increase the probability of recovery of the causative organism. The blood cultures subsequently yielded Neisseria meningitidis but direct susceptibility tests by the comparative disk diffusion method demonstrated greatly reduced zones of inhibition to penicillin (1 unit disk). Repeat testing from subcultures showed full penicillin sensitivity. Inoculation of blood culture bottles with a variety of penicillin sensitive bacteria with the addition of s-lactamases showed the same effect of false penicillin resistance, owing to carry over of sufficient s-lactamase from blood culture bottles during inoculation of direct susceptibility plates to inactivate the penicillin in the disks. Direct susceptibility tests to s-lactam agents should not be carried out on positive blood cultures to which s-lactamases have been added. Key Words: Neisseria meningitidis • s-lactamases • penicillin resistance • blood cultures |
| Databáze: | OpenAIRE |
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