Infection Foci
Infection Foci - Related Videos
04:09
Assessing DNA Damage Foci: To Identify Radiation-Induced DNA Damage Foci in Cancer Cell Line Using Immunofluorescence Staining
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2023
This video describes a protocol to detect radiation-induced DNA repair foci in the colon cancer cell lines using immunofluorescence staining. DNA repair proteins get activated at the DNA damage site; therefore, we can detect them using specific antibodies and visualize them under a fluorescence microscope.
08:48
Quantitation of γH2AX Foci in Tissue Samples
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Cited by 7 •
2010
Quantitation of DNA double-strand breaks on the basis of γH2AX foci has become an invaluable tool, particularly in radiation biology, for the evaluation of tissue radiosensitivity and effects of radiation modifying compounds. Here we demonstrate the use of an immunofluorescence assay for quantitation of γH2AX foci in tissue samples.
06:53
Quantification of γH2AX Foci in Response to Ionising Radiation
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Cited by 23 •
2010
Quantification of DNA double-strand streaks using γH2AX formation as a molecular marker has become an invaluable tool in radiation biology. Here we demonstrate the use of an immunofluorescence assay for quantification of γH2AX foci after exposure of cells to radiation.
09:33
Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
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Cited by 27 •
2017
Stress Granules (SGs) are nonmembranous cytoplasmic structures that form in cells exposed to a variety of stresses. SGs contain mRNAs, RNA-binding proteins, small ribosomal subunits, translation-related factors, and various cell signaling proteins. This protocol describes a workflow that uses several experimental approaches to detect, characterize, and quantify bona fide SGs.
12:38
4D Multimodality Imaging of Citrobacter rodentium Infections in Mice
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Cited by 19 •
2013
Multi-modality imaging is a valuable approach for studying bacterial colonization in small animal models. This protocol outlines infection of mice with bioluminescent Citrobacter rodentium and the longitudinal monitoring of bacterial colonization using composite 3D diffuse light imaging tomography with μCT imaging to create a 4D movie of C. rodentium infection.
FAQs
Tissue barriers can restrict organisms and inflammatory products to the original site, limiting immediate involvement of other tissues. When these barriers are disrupted or overcome, infectious material may move into adjacent tissue, blood, lymph, or secretions. This difference between containment and escape helps explain why some localized infections remain limited while others contribute to broader disease progression.
Inflammation reflects the interaction between pathogen growth and the host response at the affected site. Immune cells and inflammatory products can contribute to containment, but they can also influence tissue damage. Examining this balance helps biologists distinguish effects caused by infectious organisms from those produced by the host response and understand how local disease develops.
A primary focus can generate secondary sites when organisms or inflammatory products leave the original tissue through blood, lymph, adjacent tissues, or secretions. The route of movement affects where additional effects appear and whether disease remains localized or becomes systemic. Tracking these connections clarifies the progression from an initial site to broader involvement.
Containment or spread depends on the relationship among pathogen multiplication, tissue barriers, immune cells, and inflammation. A focus may remain localized when these defenses restrict infectious material, whereas escape through blood, lymph, nearby tissues, or secretions can establish wider effects. This framework connects local biological conditions with the later distribution and severity of infection.
Characterization examines the site of pathogen growth together with surrounding tissue barriers, immune cells, and inflammatory changes. Investigators can also consider whether organisms or inflammatory products remain confined or appear in routes leading to secondary sites. This combined view provides more biological information than assessing pathogen presence alone because it links location with host response and disease progression.
Locating and characterizing the focus identifies where infectious growth and the associated host response are occurring. That information can support antimicrobial treatment by connecting intervention with the site and pattern of disease, while assessment of secondary sites helps indicate whether infection has extended beyond the original tissue. The focus therefore provides a biological basis for interpreting treatment needs.
Infection foci may release organisms or inflammatory products through secretions, creating a route by which infection-related material can move beyond the original tissue. Understanding the focus and its possible pathways supports infection control by identifying how localized disease may contribute to transmission or wider biological effects. This perspective links tissue-level events with control of spread.
Studying these sites shows how pathogen multiplication, tissue barriers, immune cells, and inflammation interact in a living system. It also connects those interactions with tissue damage, formation of secondary sites, and systemic infection. In biology, this makes infection foci useful for tracing how a local encounter between host and pathogen produces progressively broader effects.