Intracellular Bacterial Load
Intracellular Bacterial Load - 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.
02:06
Visualizing Intracellular Bacterial Communities in an Infected Mouse Bladder
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2026
Source: Conover, M. S. et. al., Establishment and Characterization of UTI and CAUTI in a Mouse Model. J. Vis. Exp. (2015)This video demonstrates the detection of intracellular bacterial communities (IBCs) in mouse bladder tissue infected with β-galactosidase-expressing Escherichia coli. Following tissue fixation, permeabilization, and staining with X-gal, IBCs appear as blue puncta under a dissecting microscope, confirming bacterial invasion during urinary tract infection.
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...
02:57
Assessing Intracellular Bacterial Persistence and Antibiotic Resistance in a Mouse Model
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2026
Source: Zhang, C., et al., Development and Assessment of Intracellular Infection Models for Staphylococcus aureus. J. Vis. Exp. (2025)The video demonstrates the isolation of kidneys containing Staphylococcus aureus-infected macrophages, followed by tissue homogenization to release intracellular bacteria. It quantifies bacterial persistence within macrophages in control and antibiotic-treated groups by counting colony-forming units.
03:57
Bacterial Infection Quantitation Assay: A Method to Quantify Intraocular Bacterial Load in Mouse Model of Bacterial Endophthalmitis
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2025
This video describes the technique of quantifying bacterial infection from eye homogenates obtained from a murine model of bacterial endophthalmitis caused by Bacillus cereus. This technique helps study the host immune response and its dependency on the host and ocular bacterial gene expression in murine models.
FAQs
A reliable measurement depends on separating bacteria inside host cells from organisms remaining outside them. Researchers therefore remove or suppress surface bacteria before disrupting the host cells. This separation matters because extracellular organisms could inflate the apparent intracellular value and obscure whether differences reflect bacterial entry, intracellular survival, or host-cell responses.
Host-cell lysis makes bacteria residing within host cells accessible for measurement. Before lysis, surface-associated organisms must be removed or suppressed; afterward, released bacteria can be quantified using colony-forming unit assays, microscopy, or molecular methods. Keeping these stages distinct focuses the result on bacteria recovered from host cells rather than organisms that were never internalized.
Changes can reflect differences in bacterial entry, replication, persistence, virulence, or host-cell responses. A higher or lower measurement therefore helps researchers compare how successfully bacteria establish themselves within cells and how the cellular environment affects infection. Interpreting the value alongside the experimental condition can clarify which stage of the host-pathogen interaction may differ.
These approaches provide complementary ways to quantify bacteria released from host cells or assess their presence in the cellular setting. Colony-forming unit assays, microscopy, and molecular methods can support comparisons of intracellular bacterial load, while the choice of readout shapes how researchers evaluate infection, persistence, and responses to antimicrobial treatment.
It is particularly informative when bacteria may remain hidden inside host cells during treatment. Measuring the intracellular population helps researchers compare susceptibility to antimicrobial treatment and assess whether an intervention reaches bacteria in their cellular environment. This perspective can distinguish effects on intracellular organisms from results that mainly reflect bacteria outside host cells.
Researchers can use the measurements to compare bacterial entry, intracellular replication, persistence, and virulence across experimental conditions. They can also examine how host cells respond during infection and how antimicrobial treatment changes the bacterial population. These comparisons connect a quantitative outcome with specific stages of host-pathogen interaction rather than treating infection as a single process.
The measurement provides a way to examine how immune defenses and conditions within host cells shape infection outcomes. Differences in load may indicate that cellular responses restrict bacterial survival or that bacteria persist despite those defenses. In biology, this context supports host-pathogen interaction studies and helps evaluate therapies intended to reach bacteria residing inside cells.