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Updated: Apr 18, 2026

Author Spotlight: Optimizing CFU Determination for Efficient Assessment of TB Vaccine Efficacy and Antigen Presentation Analysis
Published on: July 28, 2023
Immunofluorescence microtip sensor for point-of-care tuberculosis (TB) diagnosis
Jong-Hoon Kim1, Kyong-Hoon Lee, Gerard A Cangelosi
1Department of Mechanical Engineering, University of Washington, Seattle, WA, USA.
Abstract:
A immunofluorescence microtip sensor was developed for specific detection of Mycobacterium cells in sputum samples by the combination of electric field, streaming flow, and immuno-affinity binding. The detection limit was 200 CFU/mL in human sputum, which was comparable to PCR but without requiring bacteriological culture, centrifugation, or nucleic acid amplification. In spite of the complex nature of physical, chemical, and biological mechanisms, the simple operation of "dipping and withdrawal" of tips will allow for screening by minimally trained personnel within 30 min. In addition, the minimal power requirement (5 W) combined with low assay cost is ideal for point-of-care (POC) screening in resource-limited settings.
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