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Journal of Clinical Pathology logoLink to Journal of Clinical Pathology
. 1986 Nov;39(11):1259–1263. doi: 10.1136/jcp.39.11.1259

Novel method for detecting micro-organisms in blood cultures.

D Sawhney, S Hinder, D Swaine, E Y Bridson
PMCID: PMC1140775  PMID: 3098802

Abstract

A method for detecting the growth of micro-organisms in blood culture by a visual signal is described. The system utilises a single blood culture medium that has been specifically formulated to support growth of aerobic, anaerobic, and microaerophilic micro-organisms. The system is based on the principle that when micro-organisms grow in the medium in a sealed bottle their metabolic products create positive pressure. This positive pressure displaces the infected blood and broth into an upper chamber, which acts as a visual signal of microbial activity. All the test micro-organisms, when inoculated at less than 20 colony forming units into simulated human blood cultures, gave a positive signal.

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