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, pathogene
any agent that can cause disease


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


A disease-producing agent; usually refers to living organisms.
References in periodicals archive ?
5 years old and kept at Zoo Dresden, developed local and systemic infections with various opportunistic pathogens within a period of 4 months.
Mycobacterium genavense in the Netherlands: an opportunistic pathogen in HIV and non-HIV immunocompromised patients.
Our data suggest as possible role for BB0347 in Lyme disease pathogenesis, as it shares characteristics with other proteins, such as those from the opportunistic pathogen Staphylococcus aureus, which are known to be crucial for disease progression.
Abstract Candida dubliniensis is a newly described fungal opportunistic pathogen that is closely related phylogenetically to C.
The research involves an opportunistic pathogen known as Pseudomonas aeruginosa, the same bacterium that caused astronaut Fred Haise to become sick during the Apollo 13 mission to the moon in 1970.
detected in the present study, is an important opportunistic pathogen and can cause food spoilage (7).
Thus this ancestral bacterium' might then be an opportunistic pathogen, sometimes lethal to insects and sometimes benign.
shigelloides, a gram-negative bacterial rod, is an opportunistic pathogen in the immunocompromised host and has been suspected to cause diarrheal illness in normal hosts (1,2).
a gram negative bacteria is ubiquitous and opportunistic pathogen which produce disease in moist adverb climate (Heras et al.
However, this opportunistic pathogen is often not considered in the differential diagnosis of pneumonia in transplant recipients.

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