Drosophila Infection
Drosophila Infection - Related Videos
02:29
Establishing Bacterial Infection in Drosophila Larvae
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2026
Source: Hiroyasu, A., D et. al., Extraction of Hemocytes from Drosophila melanogaster Larvae for Microbial Infection and Analysis. J. Vis. Exp. (2018)This video demonstrates the procedure for establishing a bacterial infection in Drosophila larvae by placing them into a bacterial droplet and pricking them with a tungsten needle. The larvae are then incubated on a grooved, nutrient-rich agar plate to study host-pathogen interactions.
09:46
Wolbachia Bacterial Infection in Drosophila
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Cited by 4 •
2007
03:25
Oral Infection of Drosophila melanogaster with Pathogenic Bacteria
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2026
Source: Siva-Jothy, J. A., et al. Oral Bacterial Infection and Shedding in Drosophila melanogaster. J. Vis. Exp. (2018)The video demonstrates the oral infection of Drosophila melanogaster with pathogenic bacteria. It includes the preparation of infection vials and the transfer of starved flies to enable bacterial ingestion. The procedure captures gut colonization, followed by surface sterilization and homogenization of flies. Finally, it shows quantification of internal bacterial load through...
10:12
Systemic Bacterial Infection and Immune Defense Phenotypes in Drosophila Melanogaster
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Cited by 69 •
2015
Drosophila melanogaster is an outstanding model organism for studying innate immune systems and the physiological consequences of infection and disease. This protocol describes how to deliver robust and quantitatively repeatable bacterial infections to D. melanogaster, and how to subsequently measure infection severity and quantify the host immune response.
02:35
High-Resolution Confocal Imaging of Pathogen-Infected Drosophila Hemocytes
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2026
Source: Hiroyasu, A., et al. Extraction of Hemocytes from Drosophila melanogaster Larvae for Microbial Infection and Analysis. J. Vis. Exp. (2018)This video demonstrates high-resolution confocal imaging of Drosophila melanogaster hemocytes infected with Coxiella burnetii to visualize pathogen localization in 3D, enabling detailed analysis of intracellular infection dynamics and host-pathogen interactions.
FAQs
After pathogen recognition, Toll and Imd signaling pathways help organize several innate defenses rather than acting as isolated responses. Their activation is associated with antimicrobial peptide production, while infection can also trigger melanization and cellular defenses such as phagocytosis. Examining these linked outcomes helps researchers determine how host defenses respond to invading microbes.
Because fruit flies lack adaptive immunity, experiments emphasize conserved innate mechanisms without the added complexity of antibody- or lymphocyte-based responses. This makes the model useful for analyzing pathogen recognition, immune regulation, antimicrobial activity, and host defense directly. Results can then support comparisons with conserved principles of infection biology in other organisms.
Feeding, wounding, and microinjection introduce pathogens under different experimental conditions. Feeding examines exposure through ingestion, wounding allows entry through a damaged surface, and microinjection provides a direct introduction into the fly. Selecting among these routes helps align the experiment with its question and provides context for interpreting immune responses.
Comparing pathogen classes allows investigators to examine how different infectious agents relate to host recognition and defense outcomes. Measurements such as antimicrobial peptide production, melanization, and phagocytosis can reveal shared or differing immune responses. These comparisons also support studies of pathogen virulence, host susceptibility, and the broader principles governing host-pathogen interactions.
A typical study introduces a selected bacterium, fungus, virus, or parasite by feeding, wounding, or microinjection, then examines the resulting host response. Investigators can evaluate immune activation through antimicrobial peptide production, melanization, and phagocytosis, while also considering pathogen virulence and immune regulation. This workflow connects the exposure method with measurable infection outcomes.
The model is particularly useful when researchers need rapid experimental analysis of innate immunity, pathogen virulence, or antimicrobial activity. Its conserved immune mechanisms support studies of host defense and disease mechanisms, while its simplicity helps investigators explore immune regulation. Findings may also inform therapeutic development by identifying principles relevant beyond the fly system.