Gastritis is inflammation of the lining of the stomach. It may occur as a short episode or may be of a long duration. There may be no symptoms but, when symptoms are present, the most common is upper abdominal pain. Other possible symptoms include nausea and vomiting, bloating, loss of appetite and heartburn. Complications may include stomach bleeding, stomach ulcers, and stomach tumors. When due to autoimmune problems, low red blood cells due to not enough vitamin B12 may occur, a condition known as pernicious anemia.
Atrophic gastritis is a process of chronic inflammation of the gastric mucosa of the stomach, leading to a loss of gastric glandular cells and their eventual replacement by intestinal and fibrous tissues. As a result, the stomach's secretion of essential substances such as hydrochloric acid, pepsin, and intrinsic factor is impaired, leading to digestive problems. The most common are vitamin B12 deficiency possibly leading to pernicious anemia; and malabsorption of iron, leading to iron deficiency anaemia. It can be caused by persistent infection with Helicobacter pylori, or can be autoimmune in origin. Those with autoimmune atrophic gastritis (Type A gastritis) are statistically more likely to develop gastric carcinoma, Hashimoto's thyroiditis, and achlorhydria.
Gut microbiota, gut microbiome, or gut flora, are the microorganisms, including bacteria, archaea, fungi, and viruses, that live in the digestive tracts of animals. The gastrointestinal metagenome is the aggregate of all the genomes of the gut microbiota. The gut is the main location of the human microbiome. The gut microbiota has broad impacts, including effects on colonization, resistance to pathogens, maintaining the intestinal epithelium, metabolizing dietary and pharmaceutical compounds, controlling immune function, and even behavior through the gut–brain axis.
Methanobacteria is a class of archaeans in the kingdom Euryarchaeota. Several of the classes of the Euryarchaeota are methanogens and the Methanobacteria are one of these classes.
Rikenellaceae is a family of Gram-negative bacteria described by Noel R. Krieg in 2015. It contains nine genera, five of which are validly published by the International Code of Nomenclature of Prokaryotes. Bacteria with 16S ribosomal RNA highly similar to the Rikenella genus, as compared to the larger taxonomic order Bacteroidales, are classified in this family.
Bergey's Manual of Systematic Bacteriology is the main resource for determining the identity of prokaryotic organisms, emphasizing bacterial species, using every characterizing aspect.
Sutterella is a genus of Gram-negative, rod-shaped, non-spore-forming, Betaproteobacteria whose species have been isolated from the human gastrointestinal tract as well as canine feces. The genus of the family Sutterellaceae currently encompasses 4 distinct species, though at least 5 additional species have been proposed that do not yet meet International Code of Nomenclature of Prokaryotes (ICNP) standards for classification. Sutterella are frequently referred to as commensal in the context of human hosts, but are associated with inflammation, which has implications for a number of diseases.
The Lachnospiraceae are a family of obligately anaerobic, variably spore-forming bacteria in the order Eubacteriales that ferment diverse plant polysaccharides to short-chain fatty acids and alcohols (ethanol). These bacteria are among the most abundant taxa in the rumen and the human gut microbiota. Members of this family may protect against colon cancer in humans by producing butyric acid. Lachnospiraceae have been found to contribute to diabetes in genetically susceptible (ob/ob) germ-free mice.
Pseudobutyrivibrio is a Gram-negative, anaerobic and non-spore-forming bacterial genus from the family of Lachnospiraceae.
Desulfuromonas is a Gram negative bacterial genus from the family of Desulfuromonadaceae. Desulfuromonas can reduce elemental sulfur to H2S. Desulfuromonas occur in anoxic sediments and saline lakes.
Anaerostipes is a Gram positive and anaerobic bacterial genus from the family of Lachnospiraceae. Anaerostipes occurs in the human gut. Anaerostipes may protect against colon cancer in humans by producing butyric acid.
Dolosigranulum is a Gram-positive, non-spore-forming, facultatively anaerobic and non-motile bacterial genus from the family of Carnobacteriaceae, with one known species.
Bergeyella is a rod-shaped, Gram-negative, aerobic, non-spore-forming and non-motile genus from the family of Weeksellaceae.
Dysgonomonas is a Gram-negative and facultatively anaerobic genus from the family of Dysgonomonadaceae which have been isolated from human sources. Dysgonomonas bacteria can cause gastroenteritis in immunocompromised persons
Ignavigranum is a Gram-positive, facultatively anaerobic non-spore-forming and non-motile genus of bacteria from the family of Aerococcaceae with one known species.
Pseudoramibacter is a Gram-positive, strictly anaerobic, non-spore-forming and non-motile bacterial genus from the family of Eubacteriaceae with one known species. Pseudoramibacter bacteria occur in birds. Pseudoramibacter alactolyticus is associated with endodontic infections.
Oscillospiraceae is a family of bacteria in the class Clostridia. All Oscillospiraceae are obligate anaerobes. However, members of the family have diverse shapes, with some rod-shaped and others cocci.
Varibaculum is a Gram-positive, facultatively anaerobic, non-spore-forming and non-motile genus of bacteria from the family of Actinomycetaceae.
Mycobacterium ulcerans is a species of bacteria found in various aquatic environments. The bacteria can infect humans and some other animals, causing persistent open wounds called Buruli ulcer. M. ulcerans is closely related to Mycobacterium marinum, from which it evolved around one million years ago, and more distantly to the mycobacteria which cause tuberculosis and leprosy.
Lillian V. Holdeman Moore was an American microbiologist who was instrumental in founding The Anaerobe Lab at Virginia Tech. The Anaerobe Lab was built in 1970 and lab scientists led the world in developing techniques to grow and identify anaerobic bacteria in culture. She was an authority in the field of anaerobic bacteriology and food poisoning.
