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Updated: Aug 2, 2026
Infection of Zebrafish Embryos with Intracellular Bacterial Pathogens
Published on: March 15, 2012
A new protocol for multispecies bacterial infections in zebrafish and their monitoring through automated image
Désirée A Schmitz1,2, Tobias Wechsler1, Hongwei Bran Li1,3
1Department of Quantitative Biomedicine, University of Zurich, Zurich, Switzerland.
Abstract:
The zebrafish Danio rerio has become a popular model host to explore disease pathology caused by infectious agents. A main advantage is its transparency at an early age, which enables live imaging of infection dynamics. While multispecies infections are common in patients, the zebrafish model is rarely used to study them, although the model would be ideal for investigating pathogen-pathogen and pathogen-host interactions. This may be due to the absence of an established multispecies infection protocol for a defined organ and the lack of suitable image analysis pipelines for automated image processing. To address these issues, we developed a protocol for establishing and tracking single and multispecies bacterial infections in the inner ear structure (otic vesicle) of the zebrafish by imaging. Subsequently, we generated an image analysis pipeline that involved deep learning for the automated segmentation of the otic vesicle, and scripts for quantifying pathogen frequencies through fluorescence intensity measures. We used Pseudomonas aeruginosa, Acinetobacter baumannii, and Klebsiella pneumoniae, three of the difficult-to-treat ESKAPE pathogens, to show that our infection protocol and image analysis pipeline work both for single pathogens and pairwise pathogen combinations. Thus, our protocols provide a comprehensive toolbox for studying single and multispecies infections in real-time in zebrafish.
Insights
Researchers developed a new zebrafish model for studying bacterial infections. This tool enables real-time tracking of single and mixed-species infections in the otic vesicle, advancing disease pathology research.
Area of Science:
- Microbiology
- Infectious Diseases
- Zebrafish Model Organisms
Background:
- The zebrafish (Danio rerio) is a valuable model for studying infectious diseases due to its transparency, allowing live imaging of infection dynamics.
- Studying multispecies infections is crucial for understanding complex host-pathogen interactions, but established protocols in zebrafish are lacking.
- Existing limitations include the absence of standardized multispecies infection protocols for specific organs and inadequate automated image analysis tools.
Purpose of the Study:
- To establish a robust protocol for single and multispecies bacterial infections in the zebrafish otic vesicle.
- To develop an automated image analysis pipeline for tracking infection dynamics and quantifying pathogen loads.
- To provide a comprehensive toolbox for in-vivo studies of complex microbial communities.
Main Methods:
- Developed a protocol for introducing single and pairwise combinations of ESKAPE pathogens (Pseudomonas aeruginosa, Acinetobacter baumannii, Klebsiella pneumoniae) into the zebrafish otic vesicle.
- Utilized deep learning for automated segmentation of the otic vesicle in microscopic images.
- Implemented scripts for quantifying pathogen frequencies via fluorescence intensity measurements.
Main Results:
- Successfully established and tracked both single and multispecies bacterial infections within the zebrafish otic vesicle.
- The developed image analysis pipeline accurately segmented the otic vesicle and quantified bacterial loads.
- Demonstrated the efficacy of the protocol and pipeline using challenging ESKAPE pathogens in single and pairwise combinations.
Conclusions:
- The developed protocol and image analysis pipeline offer a powerful tool for real-time investigation of single and multispecies infections in zebrafish.
- This advancement facilitates the study of pathogen-pathogen and pathogen-host interactions in a dynamic, in-vivo setting.
- The toolbox supports research into complex infectious diseases using the zebrafish model.
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