Systemic Infection
Systemic Infection - Related Videos
02:36
A Septic Pinprick Technique to Introduce Systemic Bacterial Infection in Flies
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2025
This video demonstrates a technique to infect Drosophila by introducing a pathogenic bacteria directly into their body cavity. This method bypasses epithelial barriers and other passive defense mechanisms, allowing for the induction of systemic infection. Upon infection, the resulting immune response is assessed by monitoring fly mortality and performing downstream assays.
03:52
Quantification of Bacterial Load in Mouse Spleen and Liver After Systemic Infection
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2026
Source: Ahn, J. J., et al. Experimental Infection with Listeria monocytogenes as a Model for Studying Host Interferon-γ Responses. J. Vis. Exp. (2016)The video demonstrates bacterial load measurement in spleen and liver tissues isolated from mice infected with an intracellular bacterial pathogen. Bacteria, accumulated within tissue-resident phagocytes during systemic infection, are released using detergent-based lysis and mechanical disruption. Serial dilutions of the homogenates are plated on...
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.
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.
13:19
The Use of Chemostats in Microbial Systems Biology
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Cited by 67 •
2013
Cell growth rate is a regulated process and a primary determinant of cell physiology. Continuous culturing using chemostats enables extrinsic control of cell growth rate by nutrient limitation facilitating the study of molecular networks that control cell growth and how those networks evolve to optimize cell growth.
FAQs
Dissemination can occur when pathogens move from a localized focus into the bloodstream or lymphatic system. These body-wide transport routes allow infectious agents to reach multiple organs rather than remaining confined to the entry site. In biological analysis, identifying the route of spread helps connect the original infection with later tissue involvement and the resulting pattern of disease.
Once pathogens disseminate, immune and inflammatory responses occur in affected tissues throughout the body. This response is important for host-pathogen interactions, but widespread inflammation can also disturb normal organ function. Biology therefore examines both pathogen distribution and host responses, because disease severity reflects their interaction rather than pathogen presence alone.
Systemic infection can become especially dangerous when widespread inflammation disrupts organ function. The overview links this severe progression with sepsis, making organ effects an important biological outcome to monitor. This connection distinguishes dissemination from a life-threatening inflammatory state and explains why researchers study inflammatory mechanisms alongside the pathogen itself.
Researchers investigate diagnostic indicators that reveal when an infection has extended beyond its original site or is affecting the body broadly. Such indicators can help connect pathogen dissemination with inflammatory and organ-related changes. In biology and medicine, this work supports recognition of severe disease and provides measurable outcomes for evaluating disease progression.
Because pathogens may disseminate through the bloodstream or lymphatic system, treatment research must address infection beyond the initial focus. Studies of systemic infection support development of antimicrobial treatments while also clarifying how host responses contribute to illness. The goal is to control the infectious process and reduce the likelihood that widespread disease will impair organ function.
Preventing a localized infection from spreading can limit exposure of distant organs to pathogens and reduce the chance of widespread inflammation. This prevention-oriented perspective complements treatment after dissemination has occurred. In research, it connects local infection control with broader disease prevention and helps explain why stopping progression early may reduce life-threatening outcomes.