pathogen

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pathogen

, pathogene
any agent that can cause disease
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Pathogen

Any agent capable of causing disease. The term pathogen is usually restricted to living agents, which include viruses, rickettsia, bacteria, fungi, yeasts, protozoa, helminths, and certain insect larval stages. See Disease

Pathogenicity is the ability of an organism to enter a host and cause disease. The degree of pathogenicity, that is, the comparative ability to cause disease, is known as virulence. The terms pathogenic and nonpathogenic refer to the relative virulence of the organism or its ability to cause disease under certain conditions. This ability depends not only upon the properties of the organism but also upon the ability of the host to defend itself (its immunity) and prevent injury. The concept of pathogenicity and virulence has no meaning without reference to a specific host. For example, gonococcus is capable of causing gonorrhea in humans but not in lower animals. See Medical mycology, Medical parasitology, Plant pathology, Plant viruses and viroids, Virulence

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.

pathogen

[′path·ə·jən]
(medicine)
A disease-producing agent; usually refers to living organisms.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Monteiro says his 3-in-1 approach to developing a new vaccine could save lives in developing countries, where the three common pathogens kill over 100,000 children under the age of five every year.
The researchers found that 61.7 percent of the 958 participants were positive for one or more pathogens (29.4 percent rhinovirus), and that 16.9 percent of participants experienced treatment failure.
Sustaining high strawberry yields will require an integrated approach that includes collaborative management of fields to limit the spread of soilborne pathogens. [Graphic omitted]
Other applications of NGS include pathogen surveillance (such as in animal populations, water supplies, or food processing) and can discover previously unrecognized or never-before seen pathogens.
Given the potential for interactions between pathogens and mycorrhizae on plant roots under field conditions, these interactions may be essential elements of the plant-mycorrhizae mutualistic association in natural populations.
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Still, the bacteria have remained a common and significant pathogen, contaminating environmental surfaces in facilities that produce ready-to-eat (RTE) meat and poultry products, despite the implementation of HACCP controls.
has introduced the portable Zephyr Pathogen Identifier system, which delivers extremely rapid, highly reliable detection of bacteria, virus and toxins in powder and liquid samples in minutes.
Pathogens were found in all the types of storage solutions examined in the study, and some of the solutions tested positive for pathogens every time they were tested.
"When antibiotics are misused or over-used by patients, disease-causing pathogens develop resistance to the drugs most preferable to treat the illness.
Using genomic sequencing, the spelling out of billions of genetic instructions stored in DNA, the study identified several methyltransferase protein families that are very similar in otherwise very distantly related human bacterial pathogens. These proteins also were found in hosts such as humans, mouse and rat.
Introduction, 2 Surveillance for foodborne pathogens in humans 3.