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Periodontitis is a common problem in patients with diabetes mellitus (DM), however, differences in the putative periodontal pathogens in subjects with DM compared to non-DM subjects are still inconclusive. The red complex, which includes Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia, encompasses the most important pathogens in adult periodontal disease. The aim of the present...
This study evaluated the effect of a new hydrolizate from poultry feathers on growth kinetics and aminopeptidase activities of eight bifidobacteria compared with common peptones. The growth kinetics results suggest that the experimental hydrolizate could be a cheaper medium ingredient without affecting the modulation of common aminopeptidase activities.
In this study, 1325 anaerobes were analyzed by MALDI-TOF MS. Of these, 92.5% were correctly identified at the species level. One unidentified species and several uncommon and rare species were identified. These results show that this technique has become the new gold standard for the routine identification of clinical anaerobes.
Some agents, including Escherichia coli and group A Streptococcus pyogenes cause infections in oxygen depleted sites. LL-37 is a human host defence peptide shown previously to play an important role in controlling infections caused by these bacteria. However, the effect of oxygen levels on the antimicrobial activity of LL-37 remains obscure. In order to test the effect of oxygen (or lack thereof)...
The aim of this study was to evaluate the sporicidal activity of hospital disinfectants against spores of two Brazilian Clostridium difficile ribotypes and the BI/NAP1/027. Our results showed that CloroRio ® and Cidex Opa ® were the most efficient agents for eliminating spores of C difficile.
The mariner transposon vector pYV07 was tested for use in the mutagenesis of Bacteroides fragilis 638R. The transposon vector efficiently generated mutants in B. fragilis 638R. The transposon disrupted genes were scattered throughout the genome of B. fragilis 638R. This method serves as a powerful tool to study B. fragilis.
A 2-day-old goat died suddenly after the onset of severe diarrhea. No specific gross lesions were observed except for a remarkably thin intestinal wall and watery intestinal contents. Histopathological analysis revealed large numbers of Gram-positive bacilli layered upon the intestinal epithelia of the small intestine. Heavy growth of only Clostridium perfringens type E, and no detection of the other...
The toxin–antitoxin gene systems (TASs) are present in the genomes of the overwhelming majority of bacteria and archaea. These systems are involved in various cellular regulatory processes (including stress response), and have not been previously investigated in Lactobacilli. We identified 6 putative TASs with toxins belonging to the MazE and RelE superfamilies (PemK1-А1 Lrh , PemK2-А2 ...
Clostridium difficile is a leading cause of hospital-acquired diarrhoea and represents a major challenge for healthcare providers. Due to the decreasing efficacy and associated problems of antibiotic therapy there is a need for synergistic and alternative treatments. In this study we investigated the use of a specific bacteriophage, ΦCD27, in a human colon model of C. difficile infection. Our findings...
Bacteroides fragilis is the anaerobe most frequently isolated from clinical specimens and piperacillin/tazobactam is among the drugs that can be used to treat polymicrobial infections in which this bacteria is often involved. During antibiotic therapy, inhibitory concentrations of antibiotics are always followed by subinhibitory concentrations which can generate phenotypic changes in bacteria. So,...
With the exceptions of the bifidobacteria, propionibacteria and coriobacteria, the Actinobacteria associated with the human gastrointestinal tract have received little attention. This has been due to the seeming absence of these bacteria from most clone libraries. In addition, many of these bacteria have fastidious growth and atmospheric requirements. A recent cultivation-based study has shown that...
Piglet diarrhea is associated with increased pre-weaning mortality, poor growth rates, and variation in weight at weaning. Clostridium difficile is a known cause of enteric disease in neonatal piglets, yet risk factors associated with C. difficile infection in piglets are unknown. The objectives of this study were (1) to evaluate the consistency and severity of lesions in piglets challenged with C...
Human intestinal microbiota plays an important role in the maintenance of host health by providing energy, nutrients, and immunological protection. Intestinal dysfunction is a frequent complaint in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) patients, and previous reports suggest that dysbiosis, i.e. the overgrowth of abnormal populations of bacteria in the gut, is linked to the pathogenesis...
Linear inulin-type fructan (ITF) prebiotics have a putative role in the prevention of colorectal cancer, whereas relatively little is known about branched fructans. This study aims to investigate the fermentation properties and potential prebiotic activity of branched fructans derived from Agave angustifolia Haw, using the Simulator of Human Intestinal Microbial Ecosystem (SHIME) model. The proximal,...
The objective of this study was to investigate the potential of magnetic nanoparticles to potentiate, but also to accomplish a sustained and controlled drug release and subsequently improve the efficacy of antibiotics against Enterococcus faecalis, one of the most resistant opportunistic pathogens, that poses a threat to chronically infected or immunocompromised patients and is difficult to eradicate...
Veillonella atypica, Veillonella denticariosi, Veillonella dispar, Veillonella parvula, and Veillonella rogosae have been reported to be isolated from human oral cavities. The recently detected Veillonellatobetsuensis in human tongue biofilms was proposed as a novel Veillonella sp.In this study, to determine the distribution and frequency of V. tobetsuensis, we established a method for the detection...
Salmonella spp., Lawsonia intracellularis, and Brachyspira spp. are pathogens commonly associated with diarrhea in growing and finishing pigs. Brachyspira spp. infection has recently reemerged as a significant concern due to an increase in the incidence of swine dysentery; however, the mechanisms underlying this increase in dysentery remain largely unknown. Pigs are also well-recognized as potential...
Clostridium difficile is a significant nosocomial threat to human health and is the most commonly identified cause of antibiotic-associated diarrhea. The development of C. difficile colitis requires production of toxins A and/or B, but some strains do not express these proteins. These non-toxigenic C. difficile (NTCD) have garnered attention for their capacity to colonize humans and potentially reduce...
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