Zebrafish Infection
Zebrafish Infection - Related Videos
11:18
Infection of Zebrafish Embryos with Intracellular Bacterial Pathogens
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Cited by 234 •
2012
Transparent zebrafish embryos have proved useful model hosts to visualize and functionally study interactions between innate immune cells and intracellular bacterial pathogens, such as Salmonella typhimurium and Mycobacterium marinum. Micro-injection of bacteria and multi-color fluorescence imaging are essential techniques involved in the application of zebrafish embryo infection models.
02:26
Development of a Zebrafish Larval Infection Model Using Microgavage
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2026
Source: Li, J., et al. Development of a Larval Zebrafish Infection Model for Clostridioides difficile. J. Vis. Exp. (2020).This video demonstrates the microgavage procedure, where an anesthetized zebrafish larva is immobilized in agarose and orally injected with a pathogenic bacterium using a tracer-guided needle. The non-invasive delivery mimics natural infection, enabling analysis of bacterial replication, toxin release, and intestinal epithelial damage.
02:56
Modeling Intestinal Infection in Zebrafish Larvae Using Foodborne Bacteria
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2026
Source: Flores, E., et al. Using the Protozoan Paramecium caudatum as a Vehicle for Food-borne Infections in Zebrafish Larvae. J. Vis. Exp. (2019).This video demonstrates the method of establishing a foodborne bacterial intestinal infection model in zebrafish larvae by feeding them paramecia infected with fluorescent E. coli.
02:46
A Phage Therapy against Pseudomonas aeruginosa Infection in Zebrafish Embryos
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2025
The video demonstrates the phage therapy technique targeting Pseudomonas aeruginosa infection in cystic fibrosis zebrafish embryos. Phage therapy effectively diminishes bacterial load and mitigates proinflammatory immune responses in CF zebrafish embryos infected with bacteria, leading to reduced CF embryo lethality.
02:24
A Technique to Quantify Fungal Infection in Zebrafish Larvae
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2025
This video demonstrates a method to quantify fungal infection in zebrafish larvae. Fungal spores are microinjected into the larval hindbrain ventricle, and the larvae are incubated to allow infection development. Infected larvae are harvested at defined intervals, and infection progress is assessed by enumerating colony-forming units.
FAQs
Inflammation and leukocyte recruitment are central links between microbial presence and the host response. As immune cells move toward infected tissue, researchers can relate their localization and activity to antimicrobial defense and changes in pathogen growth. This helps identify how cellular responses may restrict infection or accompany disease mechanisms, providing a mechanistic view of host-pathogen interactions.
Live imaging allows researchers to follow infection and immune responses in the same living animal over time, especially during transparent early developmental stages. This visibility supports direct observation of pathogen growth, leukocyte recruitment, and inflammatory processes rather than relying only on endpoint measurements. The approach therefore helps connect dynamic cellular behavior with infection outcomes.
Embryos, larvae, and adult fish provide different experimental contexts for examining infection and immunity. Early stages are especially useful for optical observation, while genetically modified lines allow investigators to test how particular host features affect microbial growth or immune activity. Comparing these contexts can clarify which responses are broadly conserved and which depend on development or genetic factors.
Studies commonly follow two linked outcomes: pathogen growth and host immune responses. Depending on the experiment, researchers may examine inflammatory activity, leukocyte recruitment, and antimicrobial defense while observing how these responses correspond to infection progression. Monitoring both sides of the interaction is important because a change in pathogen burden alone does not explain the cellular mechanisms responsible for the outcome.
The model supports investigations involving bacteria, viruses, fungi, and parasites, allowing researchers to examine how host responses vary across distinct microbial challenges. Investigators introduce the selected pathogen into embryos, larvae, or adult fish and then assess growth together with innate or adaptive immune activity. This breadth makes the system useful for comparing mechanisms across forms of infection.
These models are useful when researchers need to connect treatment effects or disease mechanisms with visible host-pathogen interactions. Their small size, optical transparency during early development, and tractable genetics support efficient investigation of antimicrobial therapies and immune responses. Findings can help relate cellular defense processes in a vertebrate model to infection mechanisms relevant to human health.