Veillonella | |
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Scientific classification | |
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Phylum: | |
Class: | |
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Genus: | Veillonella Prévot 1933 |
Type species | |
Veillonella parvula (Veillon & Zuber 1898) Prévot 1933 | |
Species | |
See text | |
Synonyms | |
"Syzygiococcus" Herzberg 1928 |
Veillonella are Gram-negative bacteria (Gram stain pink) anaerobic cocci, unlike most Bacillota, which are Gram-positive bacteria. [1] This bacterium is well known for its lactate fermenting abilities. It is a normal bacterium in the intestines and oral mucosa of mammals. In humans they have been implicated in cases of osteomyelitis and endocarditis, for example with the species Veillonella parvula .
Veillonella dispar is the most nitrate-reducing bacterium in the oral cavity, which is beneficially anti-bacterial. [2]
When Veillonella is responsible for clinical infections in humans, it should be kept in mind that more than 70% of the strains are resistant to penicillin, while more than 95% of the strains are susceptible to amoxicillin/clavulanate. [3]
Previous studies have shown that exercise is associated with changes in microbiome composition. Specifically, Veillonella, Bacteroides, Prevotella, Methanobrevibacter, and Akkermansiaceae are in more abundance in endurance athletes. [4] [5] Specifically, one study has proposed that V. atypica is beneficial for endurance performance because the high-lactate environment of the athlete provides a selective advantage for colonization by lactate metabolizing organisms, such as Veillonella. [6] Previous studies in mice have shown that propionate increases heart rate variability (HRV) and VO2 max. [7] [8] It also raises the resting energy expenditure and lipid oxidation in fasted humans. [9] These modifications are beneficial for athletes because an increase in HRV indicates that the body is adapting to the exercise stimuli, indicating an increase in fitness. [10] Also, a higher VO2 max allows the athlete to produce more energy which allows them to do more work and an increase in lipid oxidation delays glycogen depletion. [11] [12]
Lactate is fermented to propionate and acetate by the methylmalonyl-CoA pathway. Little ATP is produced in this fermentation. High substrate affinity is suggested to be the reason.
3 Lactate → acetate + 2 propionate + CO
2+ H
2O
A study of Veillonella in endurance athletes found that a relative abundance of the bacteria in the gut is associated with increased treadmill run time performance. This effect was demonstrated to be due to the organism's propionate metabolite produced from lactic acid. [13]
The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) [14] and National Center for Biotechnology Information (NCBI) [15]
16S rRNA based LTP_08_2023 [16] [17] [18] | 120 marker proteins based GTDB 07-RS207 [19] [20] [21] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Unassigned species:
Meningitis, osteomyelitis, periodontitis, and endocarditis are infections that can be caused by V. parvula. [22] [23] [24] [25] [26] [27] Prosthetic joint infection and endocarditis have been shown to be caused by V. dispar. [28] [29] Although very rare, endocarditis has also been caused by V. montpellierensis and V. alcalescens. [29]
A large percentage of Veillonella species are resistant to penicillin. [30] Antibiotics that Veillonella species are less resistant to or not resistant to at all include clindamycin, metronidazole, imipenem, ceftriaxone, and amoxicillin. [31] [32] [33] [34]
An anaerobic organism or anaerobe is any organism that does not require molecular oxygen for growth. It may react negatively or even die if free oxygen is present. In contrast, an aerobic organism (aerobe) is an organism that requires an oxygenated environment. Anaerobes may be unicellular or multicellular. Most fungi are obligate aerobes, requiring oxygen to survive. However, some species, such as the Chytridiomycota that reside in the rumen of cattle, are obligate anaerobes; for these species, anaerobic respiration is used because oxygen will disrupt their metabolism or kill them. The sea floor is possibly one of the largest accumulation of anaerobic organisms on our planet, where microbes are primarily concentrated around hydrothermal vents. These microbes produce energy in absence of sunlight or oxygen through a process called chemosynthesis, where by inorganic compounds such as hydrogen gas, hydrogen sulfide or ferrous ions are converted into organic matter.
The HACEK organisms are a group of fastidious Gram-negative bacteria that are an unusual cause of infective endocarditis, which is an inflammation of the heart due to bacterial infection. HACEK is an abbreviation of the initials of the genera of this group of bacteria: Haemophilus, Aggregatibacter, Cardiobacterium, Eikenella, Kingella. The HACEK organisms are a normal part of the human microbiota, living in the oral-pharyngeal region.
Campylobacter jejuni is a species of pathogenic bacteria that is commonly associated with poultry, and is also often found in animal feces. This species of microbe is one of the most common causes of food poisoning in Europe and in the US, with the vast majority of cases occurring as isolated events rather than mass outbreaks. Active surveillance through the Foodborne Diseases Active Surveillance Network (FoodNet) indicates that about 20 cases are diagnosed each year for each 100,000 people in the US, while many more cases are undiagnosed or unreported; the CDC estimates a total of 1.5 million infections every year. The European Food Safety Authority reported 246,571 cases in 2018, and estimated approximately nine million cases of human campylobacteriosis per year in the European Union. Campylobacter jejuni infections are increasing at an alarming rate in Europe, North America, and Australia. In Africa, Asia, and the Middle East, data indicates that C. jejuni infections are endemic.
Osteomyelitis (OM) is an infection of bone. Symptoms may include pain in a specific bone with overlying redness, fever, and weakness. The long bones of the arms and legs are most commonly involved in children e.g. the femur and humerus, while the feet, spine, and hips are most commonly involved in adults.
A blood culture is a medical laboratory test used to detect bacteria or fungi in a person's blood. Under normal conditions, the blood does not contain microorganisms: their presence can indicate a bloodstream infection such as bacteremia or fungemia, which in severe cases may result in sepsis. By culturing the blood, microbes can be identified and tested for resistance to antimicrobial drugs, which allows clinicians to provide an effective treatment.
Multiple drug resistance (MDR), multidrug resistance or multiresistance is antimicrobial resistance shown by a species of microorganism to at least one antimicrobial drug in three or more antimicrobial categories. Antimicrobial categories are classifications of antimicrobial agents based on their mode of action and specific to target organisms. The MDR types most threatening to public health are MDR bacteria that resist multiple antibiotics; other types include MDR viruses, parasites.
Staphylococcus lugdunensis is a coagulase-negative member of the genus Staphylococcus, consisting of Gram-positive bacteria with spherical cells that appear in clusters.
Bacteroides is a genus of Gram-negative, obligate anaerobic bacteria. Bacteroides species are non endospore-forming bacilli, and may be either motile or nonmotile, depending on the species. The DNA base composition is 40–48% GC. Unusual in bacterial organisms, Bacteroides membranes contain sphingolipids. They also contain meso-diaminopimelic acid in their peptidoglycan layer.
Eikenella corrodens is a Gram-negative facultative anaerobic bacillus that can cause severe invasive disease in humans. It was first identified by M. Eiken in 1958, who called it Bacteroides corrodens. E. corrodens is a rare pericarditis associated pathogen. It is a fastidious, slow growing, human commensal bacillus, capable of acting as an opportunistic pathogen and causing abscesses in several anatomical sites, including the liver, lung, spleen, and submandibular region. E. corrodens could independently cause serious infection in both immunocompetent and immunocompromised hosts.
Oritavancin, sold under the brand name Orbactiv among others, is a semisynthetic glycopeptide antibiotic medication for the treatment of serious Gram-positive bacterial infections. Its chemical structure as a lipoglycopeptide is similar to vancomycin.
Methanobrevibacter smithii is the predominant methanogenic archaeon in the microbiota of the human gut. M. smithii has a coccobacillus shape. It plays an important role in the efficient digestion of polysaccharides (complex sugars) by consuming the end products of bacterial fermentation (H2, acetate, formate to some extant). M. smithii is a hydrogenotrophic methanogen that utilizes hydrogen by combining it with carbon dioxide to form methane. The removal of hydrogen by M. smithii is thought to allow an increase in the extraction of energy from nutrients by shifting bacterial fermentation to more oxidized end products.
Kingella kingae is a species of Gram-negative facultative anaerobic β-hemolytic coccobacilli. First isolated in 1960 by Elizabeth O. King, it was not recognized as a significant cause of infection in young children until the 1990s, when culture techniques had improved enough for it to be recognized. It is best known as a cause of septic arthritis, osteomyelitis, spondylodiscitis, bacteraemia, and endocarditis, and less frequently lower respiratory tract infections and meningitis.
Cardiobacterium hominis /ˌkɑːrdiəʊbækˈtɪəriəm ˈhɒmɪnɪs/ is a microaerophilic, pleomorphic, fastidious, Gram-negative bacterium part of the Cardiobacteriaceae family and the HACEK group. It is most commonly found in the human microbiota, specifically the oropharyngeal region including the mouth and upper part of the respiratory tract. It is one of the causes of endocarditis, a life-threatening inflammation close to the heart's inner lining and valves. While infections caused by Cardiobacterium hominis are uncommon, various clinical manifestations are linked to the bacterium, including meningitis, septicemia, and bone infections.
Prevotella is a genus of Gram-negative bacteria.
Veillonella parvula is a strictly anaerobic, Gram-negative, coccus-shaped bacterium in the genus Veillonella. It is a normal part of the oral flora but can be associated with diseases such as periodontitis and dental caries as well as various systemic infections, including meningitis and osteomyelitis. It has also been isolated from women with bacterial vaginosis and has been associated with hypertension together with Campylobacter rectus and Prevotella melaninogenica.
Staphylococcus capitis is a coagulase-negative species (CoNS) of Staphylococcus. It is part of the normal flora of the skin of the human scalp, face, neck, scrotum, and ears and has been associated with prosthetic valve endocarditis, but is rarely associated with native valve infection.
Clostridium innocuum is an anaerobic, non-motile, gram-positive bacterium that reproduces by sporulation. While there are over 130 species of Clostridium, C. innocuum is the third most commonly isolated. Although it is not normally considered an aggressive human pathogen, it has been isolated in some disease processes. C. innocuum and other Clostridium line the oropharynx and gastrointestinal tract, and are considered normal gut flora.
Anaerococcus is a genus of bacteria. Its type species is Anaerococcus prevotii. These bacteria are Gram-positive and strictly anaerobic. The genus Anaerococcus was proposed in 2001. Its genome was sequenced in August 2009. The genus Anaerococcus is one of six genera classified within the group GPAC. These six genera are found in the human body as part of the commensal human microbiota.
Corynebacterium xerosis is a Gram-positive, rod-shaped bacterium in the genus Corynebacterium. Although it is frequently a harmless commensal organism living on the skin and mucus membranes, C. xerosis is also a clinically-relevant opportunistic pathogen that has been attributed to a number of different infections in animals and humans. However, its actual prominence in human medicine is up for debate due to early difficulties distinguishing it from other Corynebacterium species in clinical isolates.
Bacteroides caccae is a saccharolytic gram-negative bacterium from the genus Bacteroides. They are obligate anaerobes first isolated from human feces in the 1980s. Prior to their discovery, they were known as the 3452A DNA homology group. The type strain is now identified as ATCC 43185.