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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 many are beneficial but others can cause infectious diseases. The number of these pathogenic species in humans is estimated to be fewer than a hundred. [2]
Antibiotics can cause antibiotic-associated diarrhea by irritating the bowel directly, changing the levels of microbiota, or allowing pathogenic bacteria to grow. [7] Another harmful effect of antibiotics is the increase in numbers of antibiotic-resistant bacteria found after their use, which, when they invade the host, cause illnesses that are ...
The temperature and pH of saliva makes it conducive for bacteria to survive in the oral cavity. Bacteria in the oral cavity include Streptococcus mutans, Porphyromonas gingivalis, and Staphylococcus. [15] S. mutans is the main component of the oral microbiota. [15] A healthy oral microbiome decreases oral infections and promotes a healthy gut ...
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.
Endotoxins most commonly refer to the lipopolysaccharide (LPS) or lipooligosaccharide (LOS) that are in the outer plasma membrane of Gram-negative bacteria. The botulinum toxin , which is primarily produced by Clostridium botulinum and less frequently by other Clostridium species, is the most toxic substance known in the world. [ 1 ]
Approximately 10 to 20 percent of these samples, which were purchased across the country, were contaminated with other types of bacteria that can cause illness in addition to fecal bacteria.
As microorganisms, in particular bacteria, are found virtually everywhere, harmful microorganisms may be reduced to acceptable levels rather than actually eliminated. In food preparation, microorganisms are reduced by preservation methods such as cooking, cleanliness of utensils, short storage periods, or by low temperatures.
Bacteria such as Deinococcus radiodurans are particularly resistant to radiation, but are not pathogenic. [1] Active microbes, such as Corynebacterium aquaticum , Pseudomonas putida , Comamonas acidovorans , Gluconobacter cerinus , Micrococcus diversus and Rhodococcus rhodochrous , have been retrieved from spent nuclear fuel storage pools at ...