Exogenous Infection Origin
Exogenous Infection Origin - Related Videos
01:26
Healthcare Associated Infections I: Iatrogenic, Exogenic and Endogenic
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2023
Healthcare-associated infections (HAIs) occur in a healthcare facility while a person receives care for another ailment. This category also includes work-related infections among healthcare staff. HAIs significantly increase the cost of health care. Extended stays in healthcare institutions, increased disability, increased costs of medications, including specialized antibiotics, and prolonged recovery times add to the patient's expenses and the healthcare institution and funding bodies. Common...
02:40
Inactivation of Bacteriophages Using Exogenous Lipopolysaccharide to Generate Phage-Free Salmonella Cultures
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2026
Source: Fernández-Fernández, R., et. al. Bacteriophage Removal from Infected Salmonella Cultures. J. Vis. Exp. (2024)This video demonstrates the use of exogenous LPS (Lipopolysaccharide) as a receptor mimic to inactivate lytic bacteriophages in Salmonella cultures. Through sequential incubation, centrifugation, and washing, phages are eliminated, resulting in a viable, phage-free bacterial suspension for downstream applications.
05:35
Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Cited by 4 •
2016
Here we report protocols to detect endogenous and exogenous centromere-kinetochore proteins in human cells and quantify these protein levels at centromeres-kinetochores by indirect immunofluorescent staining through the use of fixation (paraformaldehyde, acetone, or methanol fixation).
01:26
Origin of Photosynthesis
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2026
Photosynthesis represents a fundamental biological process that transformed Earth's atmosphere and paved the way for complex life. Emerging roughly 3.4–3.8 billion years ago, the earliest photosynthetic organisms harnessed light energy to produce organic compounds. These anoxygenic phototrophs used electron donors like hydrogen sulfide (H₂S) or ferrous iron (Fe²⁺), rather than water, and did not release molecular oxygen (O₂) as a byproduct. Various groups, including green sulfur and purple...
05:30
Exogenous Mitochondrial Transfer in Differentiating Brown Adipocytes and AGPAT2-Deficient Preadipocytes
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2026
Exogenous mitochondria of human and murine origin can be internalized by differentiating preadipocytes and tracked throughout adipogenic differentiation using imaging and genetic tools. While these mitochondria physically interact with the endogenous mitochondrial network, they do not increase the expression of markers associated with mature brown adipocytes.
FAQs
An exogenous pathogen must pass a body barrier, use an entry route such as the respiratory, gastrointestinal, or genitourinary tract, or enter through broken skin. Infection develops when the organism colonizes tissue and multiplies after overcoming host defenses. This mechanism explains why barrier protection and hygiene are clinically important.
The distinction directs attention toward contact with people or animals, contaminated food or water, surfaces, or medical equipment. That information can help clinicians interpret how exposure preceded disease, select prevention measures, and support outbreak investigation, rather than treating every infection as arising from the patient’s own resident microbiota.
Following the route of entry helps organize the search for an external source. Respiratory acquisition directs attention to inhaled exposure, while gastrointestinal or genitourinary entry and broken skin suggest different pathways for reviewing possible contamination. Connecting the route with tissue colonization and multiplication also helps explain how an exposure progressed to clinical infection.
Assessment should connect the patient’s clinical infection with possible outside exposures and the route by which a microorganism could have entered. Review can include contact with people or animals, contaminated food or water, surfaces, and medical equipment, then consider whether the organism could colonize tissue and multiply. These links support diagnosis and prevention planning.
Prevention should target the identified opportunity for transmission. Hygiene can reduce transfer, disinfection can address contaminated surfaces or equipment, vaccination can reduce susceptibility, and isolation can limit spread from an infected person. Targeted antimicrobial treatment addresses the established infection, while source-oriented measures help prevent additional cases.
During outbreak investigation, confirming an exogenous source can connect cases to a shared outside origin, such as a person, animal, food, water source, surface, or medical device. This perspective helps investigators focus prevention on interrupting that exposure, using measures such as hygiene, disinfection, isolation, or vaccination when appropriate.