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Preparation of a Blood Culture Pellet for Rapid Bacterial Identification and Antibiotic Susceptibility Testing

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Published on: October 15, 2014

Rise in the Pathogenic Status of Coagulase-Negative Staphylococci Causing Bloodstream Infection.

Girish Patil¹, Pragya Agarwala¹, Padma Das¹

¹Microbiology, All India Institute of Medical Sciences, Raipur, Raipur, IND.

|April 30, 2024

Summary

This summary is machine-generated.

Coagulase-negative staphylococci (CoNS) are emerging pathogens in bloodstream infections (BSI). This study found a 2.35% prevalence of CoNS BSI, with high rates of methicillin resistance, necessitating antimicrobial stewardship.

Keywords:

bloodstream infection coagulase-negative staphylococci paired blood cultures staphylococcus haemolyticus vancomycin

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Area of Science:

Clinical Microbiology
Infectious Diseases
Antimicrobial Resistance

Background:

Coagulase-negative staphylococci (CoNS) are increasingly recognized as pathogens causing bloodstream infections (BSI).
Previously considered skin flora contaminants, CoNS now represent a significant cause of BSI.
This study addresses the need to estimate the prevalence of CoNS in BSI cases.

Purpose of the Study:

To determine the prevalence of CoNS in bloodstream infections.
To identify the predominant CoNS species causing BSI.
To assess antimicrobial susceptibility patterns of CoNS isolates.

Main Methods:

Retrospective analysis of paired blood cultures from 5085 clinically suspected sepsis cases.
Aerobic culture for five days using the BacT ALERT 3D system.
Pathogenicity established by CoNS recovery from paired blood cultures in symptomatic patients.

Main Results:

CoNS were isolated from 2.35% of patients.
Staphylococcus haemolyticus was the most common species (51.67%).
Approximately 90% of CoNS isolates were methicillin-resistant, with high resistance to non-beta-lactam antibiotics.

Conclusions:

Paired blood cultures are crucial for establishing CoNS pathogenicity in BSI.
High prevalence of methicillin resistance and resistance to other antibiotics underscores the need for antimicrobial stewardship.
Effective management of CoNS BSI requires vigilant monitoring and appropriate antibiotic use.