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Pathogenic bacteria are bacteria that can cause disease. [ 1 ] This article focuses on the bacteria that are pathogenic to humans. Most species of bacteria are harmless and are often beneficial but others can cause infectious diseases. The number of these pathogenic species in humans is estimated to be fewer than a hundred. [ 2 ]
Pathogen. 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 following outline is provided as an overview of and topical guide to concepts related to infectious diseases in humans. Infection – transmission, entry/invasion after evading/overcoming defense, establishment, and replication of disease-causing microscopic organisms (pathogens) inside a host organism, and the reaction of host tissues to ...
Mycobacterium is a genus of over 190 species in the phylum Actinomycetota, assigned its own family, Mycobacteriaceae. This genus includes pathogens known to cause serious diseases in mammals, including tuberculosis ( M. tuberculosis) and leprosy ( M. leprae) in humans. The Greek prefix myco- means 'fungus', alluding to this genus' mold -like ...
The diseases that may be caused include streptococcal toxic shock syndrome, necrotizing fasciitis, pneumonia, and bacteremia. [13] Globally, GAS has been estimated to cause more than 500,000 deaths every year, making it one of the world's leading pathogens. [13]
Human pathogen. 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.
Infectious disease. Waterborne diseases are conditions (meaning adverse effects on human health, such as death, disability, illness or disorders) [ 1]: 47 caused by pathogenic micro-organisms that are transmitted by water. These diseases can be spread while bathing, washing, drinking water, or by eating food exposed to contaminated water. [ 2]
The small brick-red rod-shaped cells appear in clusters. Mycobacterium leprae (also known as the leprosy bacillus or Hansen's bacillus) is one [ a] of the two species of bacteria that cause Hansen's disease (leprosy), [ 1] a chronic but curable infectious disease that damages the peripheral nerves and targets the skin, eyes, nose, and muscles.