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CASE REPORT
Year : 2018  |  Volume : 8  |  Issue : 1  |  Page : 61-63

Atypical pneumococcal isolate from blood


1 Department of Microbiology, Shri Sathya Sai Medical College and Research Institute, Kanchipuram, India
2 Department of Microbiology, PSG Institute of Medical Sciences and Research, Coimbatore, Tamil Nadu, India

Correspondence Address:
Dr. Jayashree Veerasamy
Department of Microbiology, Shri Sathya Sai Medical College and Research Institute, Kanchipuram, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijabmr.IJABMR_459_16

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Pneumonia with bacteremia accounts for the majority (70%) of cases of invasive pneumococcal diseases. Laboratory characterization of pneumococci is routinely done by sensitivity to optochin. We identified an atypical presentation of optochin-resistant pneumococci in blood isolate of a patient with sepsis. Polymerase chain reaction for autolysin (lytA) and pneumolysin (ply) was positive in the bile soluble isolate. Gene sequencing revealed synonymous single nucleotide polymorphism type of functional mutation in lytA gene. There have been emerging reports of optochin-resistant pneumococci. Diminishing relevance and reliability of optochin sensitivity testing in identifying pneumococci in clinical samples has been highlighted by this case report.


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