Pathogen Infection Study
Pathogen Infection Study - 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.
03:17
A Mouse Model to Study the Pathogenic Transition of Streptococcus pneumoniae Following Viral Co-Infection
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2026
Source: Lenhard, A. et al. A Mouse Model for the Transition of Streptococcus pneumoniae from Colonizer to Pathogen upon Viral Co-Infection Recapitulates Age-Exacerbated Illness. J. Vis. Exp. (2022)This video demonstrates a mouse co-infection model in which the influenza virus triggers the transition of Streptococcus pneumoniae from a colonizer to a pathogen. It outlines the steps involved in bacterial colonization, viral infection, and disease progression.
04:00
A Murine Skin Wound Infection Model to Study the Immune Response against a Bacterial Pathogen
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2025
This video demonstrates a technique to generate a murine model of skin wound infection. Upon infecting mice — engineered to express a fluorescent protein in neutrophils — with a genetically modified bioluminescent Staphylococcus aureus — a pathogenic bacteria. The bacterial burden at the infection site and the neutrophil recruitment dynamics can be studied using whole animal imaging.
02:47
Establishing a Mouse Model of Burn Infections with Pathogenic Bacteria
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2026
Source: Wang, Y., et al. In Vivo Investigation of Antimicrobial Blue Light Therapy for Multidrug-resistant Acinetobacter baumannii Burn Infections Using Bioluminescence Imaging. J. Vis. Exp. (2017)This video demonstrates how to establish a burn infection in a mouse model by applying a heated brass block followed by pathogenic bacterial inoculum. The bacteria colonize the exposed extracellular matrix and form a biofilm, enabling in vivo studies of host-pathogen interactions.
02:34
Intranasal Infection of a Mouse with a Pathogenic Influenza Virus
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2026
Source: Wang, M., et al, Evaluation of T Follicular Helper Cells and Germinal Center Response During Influenza A Virus Infection in Mice. J. Vis. Exp. (2020).This video demonstrates intranasal infection of a mouse with a pathogenic influenza virus to establish a respiratory tract infection. The procedure outlines the administration of the virus into the nasal cavity. The virus enters host cells, replicates, and activates the immune system.
FAQs
Researchers examine these stages as connected but separable processes. Measurements of cellular entry indicate how an infectious agent gains access to host cells, while replication assays reveal whether it multiplies after entry. Tissue observations then show how infection alters host structures or function. Comparing these findings helps connect early infection events with later disease outcomes.
The host response can be evaluated through inflammatory signaling and immune-cell activation. These measurements show how tissues detect infection and mobilize defensive activity. A study can compare immune responses with pathogen replication or tissue effects to determine whether particular responses accompany effective control, persistent infection, or different disease outcomes. This links cellular defense mechanisms to immunological consequences.
Pathogens may interact with host defenses in ways that affect whether infection is controlled or continues. Examining immune evasion alongside replication, inflammatory signaling, and immune-cell activation helps explain why similar infectious agents can produce different outcomes. This context is important for identifying vulnerabilities that vaccines or antimicrobial therapies could target and for understanding disease mechanisms.
Researchers may work with cells, tissues, model organisms, or clinical samples, selecting the system that fits the infection question. Under controlled conditions, they expose the chosen material to a pathogen and measure cellular entry, replication, inflammatory signaling, tissue interactions, or immune-cell activation. Comparing results across these systems can connect laboratory observations with clinical infection patterns.
Clinical samples provide material for examining infection-related processes in a patient-associated context. Researchers can assess evidence of pathogen activity, tissue interaction, or host immune responses, then relate those findings to disease outcomes. Such studies contribute to diagnostic method development while also helping investigators determine whether observations from cells, tissues, or model organisms reflect human infection.
Results identify stages and interactions that may be altered to limit infection or disease. Evidence about pathogen replication and immune evasion can guide antimicrobial strategies, while analysis of immune-cell activation and inflammatory signaling can inform vaccine development. Studies also contribute to approaches for limiting transmission by clarifying how infection progresses and produces clinically relevant outcomes.