pathogen

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Related to Disease agent: communicable disease, Infectious diseases

pathogen

, pathogene
any agent that can cause disease

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

pathogen

[′path·ə·jən]
(medicine)
A disease-producing agent; usually refers to living organisms.
References in periodicals archive ?
In simplified terms, we may categorize disease agents according to their level of development of a cell-like structure.
Herbaceous tests (3 to 6 months) where extracts from candidate plants are inoculated onto herbaceous plants which respond with the development of characteristic symptoms should the disease agent be present;
Of these disease agents a vaccine is only available for M.
The result was a proliferation of health posters and compelling images of disease and disease agents, which became a distinctive practice of the modern health campaign.
Victims say they are worried that continued use of human blood could mean they are infected with the mad cow disease agent which causes CreutzfeldtJakob Disease in humans.
To be "relevant," the prevalence of a communicable disease or disease agent must be sufficient to warrant screening or testing of all donors, the FDA said.
Among the most valued preclinical testing procedures is the use of cellular model systems - cell cultures - which allow researchers to learn how a disease agent such as a virus, bacterium, or parasite, or a potential vaccine, might affect a living cell before it is tested in a whole animal.
In order to identify a disease agent you have to have a clear clinical syndrome," says Zegans.
population; Chlamydia trachomatis, a sexually transmitted disease agent causing an estimated 90 million cases worldwide; Streptococcus pneumoniae, the leading killer of children under the age of 5 worldwide; and Plasmodium falciparum (malaria), of which there are more than 100 million cases globally.
This Agreement is to ensure medical expenses in addition to benefits paid by the compulsory general insurance scheme which is affiliated disease agent or by any other organization.
Genocea is currently developing vaccines for herpes simplex virus type2 (therapeutic and prophylactic); Chlamydia trachomatis, a sexually transmitted disease agent causing an estimated 90 million cases worldwide; Streptococcus pneumoniae, the leading killer of children under the age of 5 worldwide; and Plasmodium falciparum (malaria), of which there are more than 100 million cases globally.
Acquisition of the cat scratch disease agent Bartonella henselae by cat fleas (Siphonaptera:Pulicidae).