Agent Host Environment Model
Agent Host Environment Model - Related Videos
07:40
Introducing Experimental Agents into the Mouse
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2023
Many investigations performed in mice (Mus musculus) require the administration of an experimental agent to the animal. For example, it may be of interest to test the efficacy of a specific therapy, to induce a pathologic condition, or to administer anesthesia or palliative care. In order to ensure safe and efficient delivery, it is important to consider a variety of factors prior to the administration of the treatment. This video, which reviews agent administration in the mouse, begins by...
11:27
Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
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Cited by 5 •
2016
This protocol describes the preparation and characterization of a dendrimeric magnetic resonance imaging (MRI) contrast agent that carries cyclen-based macrocyclic chelates coordinating paramagnetic gadolinium ions. In a series of MRI experiments in vitro, this agent produced an amplified MRI signal when compared to the commercially available monomeric analogue.
11:28
Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus
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Cited by 2 •
2011
We describe a protocol to identify key roles of host signaling molecules in lytic replication of a model herpesvirus, gamma herpesvirus 68 (γHV68). Utilizing genetically modified mouse strains and embryonic fibroblasts for γHV68 lytic replication, the protocol permits both phenotypic characterization and molecular interrogation of virus-host interactions in viral lytic replication.
10:10
Experimental Infection with Listeria monocytogenes as a Model for Studying Host Interferon-γ Responses
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2016
This protocol describes how to inoculate C57BL/6J mice with the EGD strain of Listeria monocytogenes (L. monocytogenes) and to measure interferon-γ (IFN-γ) responses by natural killer (NK) cells, natural killer T (NKT) cells, and adaptive T lymphocytes post-infection. This protocol also describes how to conduct survival studies in mice after infection with a modified LD50 dose of the pathogen.
10:19
Reducing Agents
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2023
Source: Vy M. Dong and Daniel Kim, Department of Chemistry, University of California, Irvine, CA Controlling the reactivity and selectivity during the synthesis of a molecule is very important criteria for chemists. This has led to the development of many reagents that allow chemists to pick and choose reagents suitable for a given task. Quite often, a balance between reactivity and selectivity needs to be achieved. This experiment will use IR spectroscopy to monitor the reaction and to...
FAQs
Different outcomes reflect variation across the host and environment, not only differences in the agent. Host characteristics can alter susceptibility, while environmental conditions can change exposure, transmission, or disease progression. Applying all three perspectives helps clinicians and public health teams explain why one person may remain unaffected while another develops disease in the same general setting.
Considering the factors together reveals interactions that a single-factor analysis may miss. The agent identifies a possible cause, host characteristics indicate who may be susceptible, and environmental conditions clarify how exposure or transmission occurs. This combined view supports more precise identification of risks and helps locate prevention opportunities at more than one point in the disease process.
The model organizes risk according to the role each element plays. Agent-related assessment considers the potential cause, host-related assessment focuses on characteristics influencing susceptibility, and environmental assessment examines conditions affecting exposure, transmission, or progression. Separating these roles clarifies whether an intervention should address the cause, the person's vulnerability, or the surrounding conditions.
During clinical assessment, the framework organizes information about the possible agent, relevant host susceptibility, and environmental circumstances. This structure can help connect a patient's condition with exposure and setting rather than viewing symptoms in isolation. It also supports identification of risk factors that may guide prevention, clinical reasoning, and decisions about which part of the interaction requires attention.
Infection-control planning and outbreak investigation can use the framework to examine the agent, affected or susceptible hosts, and environmental conditions linked with exposure or transmission. Reviewing these elements helps organize the investigation and identify intervention points. The resulting response can target one or several components instead of assuming that controlling the agent alone will address the entire problem.
The framework supports interventions directed at the agent, host, or environment. Depending on the identified risk, an intervention may focus on the cause, reduce host susceptibility, or change environmental conditions that influence exposure, transmission, or progression. This approach is useful in clinical and public health planning because it links prevention choices to the specific factors contributing to disease.