infectious agent

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Related to infectious agent: communicable disease

infectious agent

Pathogen, see there.


1. any power, principle or substance by which something is accomplished, or which is capable of producing a chemical, physical or biological effect such as a disease.
2. of disease; any factor whose excessive presence or relative absence is essential for the occurrence of a disease.

adrenergic neuron blocking agent
one that inhibits the release of norepinephrine from postganglionic adrenergic nerve endings.
alkylating agent
a cytotoxic agent, e.g. a nitrogen mustard, which is highly reactive and can donate an alkyl group to another compound. Alkylating agents inhibit cell division by reacting with DNA and are used as antineoplastic agents.
anesthetic agent
substance capable of producing reversible general or local anesthesia.
anticholinergic agent
cholinergic blocking agent.
agent change
change in an animal's chemical or antigenic configuration can alter its pathogenicity. For example, a case of nitrate-nitrite poisoning in a cow can become a case of nitrite poisoning after conversion of the nitrate in the rumen. Mutation and antigenic drift are other types of change that vary agent pathogenicity.
chelating agent
a compound that combines with metals to form weakly dissociated complexes in which the metal is part of a ring, and is used to extract certain elements from a system.
chemical agent
substance that produces change by virtue of its chemical composition and its effects on living tissues and organisms.
cholinergic blocking agent
one that blocks the action of acetylcholine at nicotinic or muscarinic receptors of nerves or effector organs.
determinant agent
only some agents are determinants of diseases in that they always cause disease, and the same disease, and the disease does not occur without the agent. Many agents require the intervention of other factors, such as anaerobicity of tissue, hepatic insufficiency or physiological stress before they can establish their pathogenicity.
ganglionic blocking agent
one that blocks cholinergic transmission at autonomic ganglionic synapses.
immobilizing agent
see neuromuscular blockade.
infectious agent
an organism able to live in or on the tissue of a living animal; may not necessarily cause disease.
agent interaction
is the interaction between precipitating and predisposing causes of disease.
oxidizing agent
a substance that acts as an electron acceptor in a chemical oxidation-reduction reaction.
agent properties
are the properties which determine the pathogenicity of the agent, the solubility and acidity or biodegradability of a chemical, the virulence, adhesiveness, resistance to antibacterial agents of bacteria and viruses and so on.
reducing agent
a substance that acts as an electron donor in a chemical oxidation-reduction reaction.
surface-active agent
a substance that exerts a change on the surface properties of a liquid, especially one, such as a detergent, that reduces its surface tension. Called also surfactant.
therapeutic agent
a substance capable of producing a curative effect in a disease state.
agent without disease
exemplified by the orphan viruses. The agent is of a type that causes disease, but none is associated with the presence of the particular agent.
References in periodicals archive ?
Safety training for laboratory staff: For all suspected infectious agents, there must be proper training of laboratory staff, including any administrative employees who will be communicating with various departments.
In addition to the HIV test, which is able to detect HIV-1, HIV-2, and the rare group O variant of HIV-1, MedMira also has developed rapid tests for other infectious agents, including H.
Biofilms, or microbial communities that behave like biofilms, also represent potential, unrecognized stages in the pathways from infectious agent exposure to chronic disease.
One aspect that has limited enthusiasm for antibody-based therapies against infectious agents is the recognition that the efficacy of an antibody is largely a function of timing of administration relative to the development of clinical symptoms.
The collective weight of the three studies suggests that nanobacteria infection is arguably the previously unknown infectious agent associated with atherosclerotic plaque.
In an insightful paper, Ashford recognized many of the problems in the simplistic use of the term reservoir and proposed a consistent definition of a reservoir as an "ecological system in which the infectious agent survives indefinitely" (18).
Scientists often turn to military metaphors when they describe how the body tries to fend off infectious agents.
While recent studies suggest that healthcare systems are ill prepared to treat victims and contain the spread of an infectious agent (5), the performance of physicians, epidemiologists, and diagnostic specialists in identifying outbreak-associated agents as diverse as Nipah virus (6) and gastroenteric agents (7) indicate that identification of an outbreak and its associated agent may be done rapidly and successfully.
Prusiner coined the term prion, for proteinaceous infectious particle, in 1982 to label this protein--the first proposed infectious agent containing neither DNA nor RNA.
The infectious agent travels to the brain, where it inflicts its hallmark damage--transforming this organ into a hole-ridden sponge.
HPV and other infectious agents in cancer; opportunities for prevention and public health.
To investigate why allergies like hay fever and eczema were less common in children from large families, who were presumably exposed to more infectious agents than others, researchers studied the nature and function of staphylococci, harmless bacteria, which lives on the skin, Health News reported.

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