Related Experiment Video
Updated: Aug 5, 2026

Fast Colony Forming Unit Counting in 96-Well Plate Format Applied to the Drosophila Microbiome
Published on: January 13, 2023
Evaluation of an AI-Assisted Colony Counting System Across Multiple Culture Media Using Standardized Pure Culture
Xue Li1, Meng Xiao1, Dingding Li1
1Department of Laboratory Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China.
None:
Automated AI-assisted colony counting may improve standardization in digital microbiology, but performance can be affected by colony density, culture medium, colony morphology, adhesion, and plate artifacts. We evaluated the Starry-300 AI colony counting system using 382 standardized pure culture bacterial and yeast plates across four agar media. AI-assisted counts were compared with a three-reader median ImageJ-assisted manual comparator derived from independent counts by experienced technologists. The AI workflow showed close agreement with the manual consensus comparator across a broad colony density range. Overall, 360/382 plates (94.24%) were within ±10 CFU and 377/382 plates (98.69%) were within ±30 CFU of the manual median count. Error-based and agreement analyses showed a mean absolute error of 3.19 CFU/plate; both the intraclass correlation coefficient and Lin's concordance correlation coefficient were0.99. AI software analysis required approximately 5-15 s/plate, although this did not include plate handling, correction, or reporting. These findings support the analytical feasibility of reviewable AI-assisted colony enumeration under controlled pure culture conditions. Further validation using primary clinical specimens, mixed cultures, near-threshold samples, and external sites is required before broad clinical implementation.
Related Concept Videos
Techniques for Isolation of Pure Cultures
Microbial Growth Measurement: Direct Methods
Methods to Assess Microbial Populations

