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Leptospirosis is a blood infection caused by the bacteria Leptospira [8] that can infect humans, dogs, rodents and many other wild and domesticated animals. [8] Signs and symptoms can range from none to mild (headaches, muscle pains, and fevers) to severe (bleeding in the lungs or meningitis). [5]
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An etiological agent of disease may require an independent co-factor, and be subject to a promoter (increases expression) to cause disease. An example of all the above, which was recognized late, is that peptic ulcer disease may be induced by stress, requires the presence of acid secretion in the stomach, and has primary etiology in ...
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. [1] The term pathogen came into use in the 1880s.
It has long been suspected as a causative agent in Crohn's disease in humans, [4] [5] but studies have been unable to show definite correlation. [6] One study has argued that the presence of antibodies against Mycobacterium avium subspecies paratuberculosis is associated with increased propensity of patients with Crohn's disease to receive ...
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