Human Pathogenicity
Human Pathogenicity - Related Videos
07:15
Invasion of Human Cells by a Bacterial Pathogen
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Cited by 44 •
2011
A general protocol for the study of invasion of host cells by a bacterial pathogen, focusing on Staphylococcus aureus and human endothelial cells.
01:18
Immunohistochemical Detection of Pathogenic Bacteria in Human Brain Tissue
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2025
To detect these bacteria, take a deparaffinized, rehydrated, bacteria-infected human brain section with exposed protein antigens and inactivated endogenous phosphatase.
09:08
Developing a Salivary Antibody Multiplex Immunoassay to Measure Human Exposure to Environmental Pathogens
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Cited by 11 •
2016
In the current climate of scarce resources, new technologies are emerging that allow researchers to conduct studies cheaper, faster and with more precision. Here we describe the development of a bead-based salivary antibody multiplex immunoassay to measure human exposure to multiple environmental pathogens simultaneously.
10:39
Single Cell Measurements of Vacuolar Rupture Caused by Intracellular Pathogens
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Cited by 22 •
2013
We describe a method for tracking the endomembrane rupture elicited by the intracellular bacteria Shigella flexneri and Mycobacterium tuberculosis upon host cell invasion. Our assay makes use of CCF4, a host cytoplasmic FRET probe in live or fixed cells. This reporter is degraded by an enzyme activity present on the bacterial surface.
02:04
Generation of a Human Colonoid Monolayer with Barrier Function to Study Host–Pathogen Interactions
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2026
Source: In, J. G.,et al. Human Colonoid Monolayers to Study Interactions Between Pathogens, Commensals, and Host Intestinal Epithelium. J. Vis. Exp. (2019).This video demonstrates the procedure for culturing colon-derived epithelial cells on a collagen-coated Transwell system to generate a mucus-producing monolayer that models the intestinal barrier and enables host–pathogen interaction studies.
FAQs
These mechanisms can act at different stages of infection and produce distinct effects. Attachment helps an agent remain associated with human cells, invasion enables access to tissues, replication increases its presence, and toxins can damage host structures. Examining which processes occur helps investigators connect a biological agent with particular patterns of disease and assess how it interacts with the host.
Disease outcomes depend not only on the biological agent but also on the person exposed and the nature of that exposure. Differences in host susceptibility can influence whether infection develops and how severe it becomes, while exposure affects the opportunity for contact. Considering both variables improves interpretation of why the same agent may produce different outcomes across human populations.
When an agent evades or disrupts immune defenses, the host may have greater difficulty limiting its replication or preventing tissue effects. This interaction can influence whether disease remains limited or becomes more severe. Studying immune-related mechanisms therefore connects molecular or cellular behavior with clinical outcomes and helps identify processes that may be addressed through vaccines or drugs.
A study can combine pathogen identification with analysis of host interaction, exposure, and observed disease outcomes. Researchers may then use epidemiological surveillance to examine patterns across populations and perform risk assessment to evaluate potential public health consequences. Together, these approaches move from recognizing an agent to understanding its significance in human disease and transmission-related monitoring.
Mechanistic evidence identifies biological interactions that may be useful targets for intervention, including processes associated with host-cell attachment, tissue invasion, replication, toxin production, or immune disruption. Vaccine and drug development can use this information to address important stages of pathogen-host interaction. The resulting strategies aim to reduce disease or limit the consequences of infection.
It is useful whenever health professionals need to evaluate an identified or suspected biological threat, compare possible disease outcomes, or prioritize protective measures. Findings from pathogenicity studies support risk assessment, epidemiological surveillance, and infection-control planning. They also help explain why closely related organisms may require different levels of attention in human populations.