Implementation of Automated Blood Culture With Quality Assurance in a Resource-Limited Setting

Area of Science:

• Clinical Microbiology
• Infectious Diseases
• Public Health Surveillance

Background:

• Blood cultures (BC) are crucial for antimicrobial resistance surveillance, especially in resource-limited settings where manual methods prevail.
• Limited data exists on the performance of automated BC systems in African healthcare facilities.
• This study evaluated automated BC implementation within the African Network for improved Diagnostics, Epidemiology and Management of Common Infectious Agents (ANDEMIA).

Purpose of the Study:

• To compare the performance of automated versus manual blood culture systems.
• To assess yield, contamination rates, and turnaround times of both methods.
• To evaluate the feasibility of automated BC in a resource-limited African setting.

Main Methods:

• A comparative study of automated (BacT/ALERT®FA Plus) and manual (brain-heart infusion broth) BC was conducted over 8 months.
• 337 matched pairs of BC were inoculated with 10 ml of blood each from the same venipuncture.
• Automated BC were incubated for 5 days, manual BC for 10 days, with terminal subcultures for manual BC only.

Main Results:

• Automated BC showed a significantly higher positive yield (36.5%) compared to manual BC (24.0%) (p<0.01).
• Turnaround time for positive results was reduced by an average of 2.5 days with the automated system (p<0.01).
• Contamination rates were similar (47.9% automated vs. 43.8% manual, p=1.0), and isolate retesting showed 79.6% concordance.

Conclusions:

• Automated BC systems are feasible in resource-limited settings and enhance microbiological diagnostic performance.
• Implementation leads to increased pathogen detection and shorter turnaround times, aiding antimicrobial resistance surveillance.
• Sustained success requires clinician training, improved diagnostic stewardship, and careful consideration of economic and logistical factors.