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In biology, a pathogen (Greek: πάθος, pathos "suffering", "passion" and -γενής, -genēs "producer of"), in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent , or simply a germ .
Ophryocystis elektroscirrha (sometimes abbreviated OE or O.e. [1]) is an obligate, neogregarine protozoan parasite that infects monarch (Danaus plexippus) and queen (Danaus gilippus) butterflies.
Normally, pronunciation is given only for the subject of the article in its lead section. For non-English words and names, use the pronunciation key for the appropriate language. If a common English rendering of the non-English name exists (Venice, Nikita Khrushchev), its pronunciation, if necessary, should be indicated before the non-English one.
Noroviruses have been called “the perfect human pathogens.” They’re a type of highly contagious stomach bug that causes severe vomiting and diarrhea , along with headache, fever and body aches.
A human pathogen is a pathogen (microbe or microorganism such as a virus, bacterium, prion, or fungus) that causes disease in humans. The human physiological defense against common pathogens (such as Pneumocystis ) is mainly the responsibility of the immune system with help by some of the body's normal microbiota .
Phaeohyphomycosis has been attributed to more than 100 species and 60 genera of fungi over the past several decades. The pathogens are considered opportunistic. Almost all cases of widely disseminated infection have occurred in immunosuppressed people. [12]
An infection is the invasion of tissues by pathogens, their multiplication, and the reaction of host tissues to the infectious agent and the toxins they produce. [1] An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection.
Clostridium tetani is a common soil bacterium and the causative agent of tetanus.Vegetative cells of Clostridium tetani are usually rod-shaped and up to 2.5 μm long, but they become enlarged and tennis racket- or drumstick-shaped when forming spores.