Species Composition and Susceptibility to Antibiotics of Microorganisms Isolated from Tooth Sockets of Extracted Teeth in Cases of Alveolar Osteitis

Alveolar osteitis (AO) is one of the most common infectious complications after dental extractions. The data on the species composition of AO pathogens and their susceptibility to antimicrobial drugs can be the basis for their empirical use in case of inflammatory process aggravation. Objective. To determine the species composition and susceptibility to the antimicrobial agents of microorganisms, which were detected in patients with AO, who sought medical help in the oral surgery department of the dental medical center of Bogomolets National Medical University. Methods. Throughout 2018–2021, microbiological examination of tooth sockets from 30 patients with AO and 20 patients without AO was performed. The studied biological material was plated on appropriate nutrient media for isolation of aerobic, facultative and obligate-anaerobic microorganisms. Anaerobic conditions were achieved in GENbox 7.0 L and GENbox 2.5 L aerostats using GENbox anaerobic packages (“Biomerieux”, France). The genus and species identity of the bacteria were determined according to Bergey. Antibiotic susceptibility of the isolated strains was determined by disk diffusion method. Results. It was found that most commonly microorganisms from tooth sockets in case of AO are: Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus spp., Escherichia coli, Bacteroides spp., Clostridium spp., and Candida species, as well as their mixed cultures of 3–5 species of microorganisms. These aerobic and facultative anaerobic bacteria were susceptible to amoxicillin, ceftriaxone and ciprofloxacin in 92.6–100% of cases. The growth of anaerobic bacteria in 100% of cases was inhibited by colistin and meropenem. Conclusions. AO developing is caused by pathological colonization of socket of the extracted tooth by representatives of endogenous microbiota, namely Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus spp., Escherichia coli, which are present mainly in the mixed cultures with Candida albicans. For empirical antibiotic therapy of complicated forms of AO, amoxicillin or ceftriaxone or ciprofloxacin in complex with colistin or meropenem should be used, since these drugs suppress the growth of 92.6–100% of strains of aerobic, facultative and obligate anaerobic microorganisms, which are potential pathogens of the purulent forms of AO.

Metabolic Fluctuations in the Human Stool Obtained from Blastocystis Carriers and Non-Carriers

Blastocystis is an obligate anaerobic microbial eukaryote that frequently inhabits the gastrointestinal tract. Despite this prevalence, very little is known about the extent of its genetic diversity, pathogenicity, and interaction with the rest of the microbiome and its host. Although the organism is morphologically static, it has no less than 28 genetically distinct subtypes (STs). Reports on the pathogenicity of Blastocystis are conflicting. The association between Blastocystis and intestinal bacterial communities is being increasingly explored. Nonetheless, similar investigations extending to the metabolome are non-existent.Using established NMR metabolomics protocols in 149 faecal samples from individuals from South Korea (n = 38), Thailand (n = 44) and Turkey (n = 69), we have provided a snapshot of the core metabolic compounds present in human stools with (B+) and without (B−) Blastocystis. Samples included hosts with gastrointestinal symptoms and asymptomatics. A total of nine, 62 and 98 significant metabolites were associated with Blastocystis carriage in the South Korean, Thai and Turkish sample sets respectively, with a number of metabolites increased in colonised groups. The metabolic profiles of B+ and B− samples from all countries were distinct and grouped separately in the partial least squares-discriminant analysis (PLS-DA). Typical inflammation-related metabolites negatively associated with Blastocystis positive samples. This data will assist in directing future studies underlying the involvement of Blastocystis in physiological processes of both the gut microbiome and the host. Future studies using metabolome and microbiome data along with host physiology and immune responses information will contribute significantly towards elucidating the role of Blastocystis in health and disease.

ANALYSIS OF THE CONTENTS OF THE PERIODONTAL POCKET IN CHRONIC PERIODONTITIS

Микрофлора человека - сложная саморегулирующая система, способная восстанавливаться при грамотной коррекции. Исследования последних лет показали, что нарушение нормального микробиоценоза полости рта растет из года в год и у жителей Российской Федерации превышает 90 %, вызывая при этом воспалительные заболевания в тканях пародонта, и, как правило, сопровождается дисбиозом полости рта, выраженность которого соответствует степени поражения пародонта. Одно из ведущих мест в развитии данной патологии занимает резидентная облигатно-анаэробная и микроаэрофильная микрофлора полости рта. Изучение микробиологического состава пародонтальных карманов (ПК) при воспалительных заболеваниях тканей пародонта (ВЗТП) имеет большое значение непосредственно для эффективного лечения и понимания патогенетических этапов этих заболеваний. Достаточно серьезной проблемой современной стоматологии как в нашей стране, так и за рубежом являются заболевания пародонта. Указанная патология снижает принятый ВОЗ критерий качества жизни и приводит к преждевременной потере зубов и представляет серьезную медицинскую, социальную и экономическую проблему. Первичным фактором, вызывающим поражение пародонта, являются бактерии зубного налета. Этиологическая структура инфекционных процессов в последнее десятилетие значительно изменилась, что связано с постоянной эволюцией микробов и вовлечением в патологический процесс условно-патогенных микробов, которые могут выступать в качестве комменсалов в составе нормальной микрофлоры и проявлять свою патогенность при снижении иммунного статуса организма The human microflora is a complex self-regulating system that can be restored with proper correction. Recent studies have shown that the violation of the normal microbiocenosis of the oral cavity increases from year to year and in the residents of the Russian Federation exceeds 90 %, causing inflammatory diseases in the periodontal tissues, and, as a rule, is accompanied by dysbiosis of the oral cavity, the severity of which corresponds to the degree of periodontal damage. One of the leading places in the development of this pathology is occupied by the resident obligate-anaerobic and microaerophilic microflora of the oral cavity. The study of the microbiological composition of periodontal pockets (PC) in inflammatory diseases of periodontal tissues (VSTP) is of great importance directly for the effective treatment and understanding of the pathogenetic stages of these diseases. Quite a serious problem of modern dentistry both in our country and abroad are periodontal diseases. This pathology reduces the WHO-accepted quality of life criterion and leads to premature tooth loss, and is a serious medical, social and economic problem. The primary factor that causes periodontal disease is plaque bacteria. The etiological structure of infectious processes has changed significantly in the last decade, which is due to the constant evolution of microbes and the involvement of conditionally pathogenic microbes in the pathological process, which can act as commensals in the normal microflora and show their pathogenicity with a decrease in the immune status of the body

Species composition and population level of the microbiota of the contents of the maxillary sinuses and oropharynx in patients with chronic purulent maxillary sinusitis with type 1 diabetes mellitus

Aim – to study the species composition and population level of the microbiota of the contents of the maxillary sinuses and oropharynx in patients with chronic purulent maxillary sinusitis (CPMS), which arose on the background of type 1 diabetes mellitus (DM).Material and methods. A microbiological examination of 97 samples of the contents of the maxillary sinus cavity was performed. The main group consisted of 50 patients with CPMS with type 1 diabetes aged 20-67 years (10 patients aged 20-31 years, 14 patients aged 31-45 years and 26 aged 45-67 years). Among patients of the main group, endocrinologists found in 39 patients the course of type 1 diabetes of moderate severity, in 11 - severe course. The control group consisted of 47 people of the same age, who during the last 6 months did not suffer from any diseases and considered themselves practically healthy.Results. The leading pathogens in CPMS in patients with type 1 (DM) are S. pneumoniae (34% of patients), H. influenzae (24%), M. catarrhalis (24%), S. aureus (10.0%), S. pyogenes (6.0%), E. coli Hly + (2.0%). It is established that the purulent-inflammatory process in the maxillary sinuses in patients with type 1 diabetes develops against the background of the formed dysbiosis of the oropharynx: 1st degree in 6.0%, 2nd degree - in 28% of patients and 3rd degree - in 66% of patients, which is characterized by a pronounced deficiency of indigenous obligate anaerobic and aerobic bacteria and contamination of the habitat with pathogenic and opportunistic pathogens and other microorganisms.Conclusions. The leading causative agents of chronic purulent maxillary sinusitis in patients with type 1 diabetes mellitus at the present stage are: S.pneumoniae (32.0%), H.influenzae (26.0%), M.catarrhalis (24.0%), S. pyogenes (10.0%), S. aureus (6.0%) and E. coli Hly + (2.0%). Patients with chronic purulent maxillary sinusitis, which developed on the background of type 1 diabetes mellitus, are eliminated from the habitat of bifidobacteria, lactococci and S. mutans, which are important for their multifunctional role in the microbiocenosis; the number of physiologically useful lactobacilli is significantly reduced by 2 orders of magnitude, salivary streptococci by 92.91%, S.viridans by 25.17%, S.sanguis by 86.17%, S.mitis by 45.33%, M.luteus-25.35%. Against this background, the number of opportunistic pathogens increases significantly by 84.59%, fusobacteria by 69.33%, pyogenic streptococcus - by 50.5%, hemophilic bacteria - by 55.71%, moraxella - by 74.01%, yeast-like fungi of the genus Candida - by 25.63%. Bacteria that contaminate the oropharynx and the contents of the cavities of the maxillary sinuses reach a high population level (from 4.33 ± 0.14 to 5.69 ± 0.09 lg KUO \ ml). In chronic purulent sinusitis in patients with type 1 diabetes mellitus in the contents of the oropharyngeal cavity are associations of autochthonous obligate and facultative opportunistic and allochthonous microorganisms, consisting of 3 types of microorganisms in 3 (6%) patients, out of 4 in 41 ( 82%) and out of 5 in 6 (12%) patients. Chronic purulent process in the maxillary sinus in patients with type 1 diabetes mellitus develops against the background of the formed dysbacteriosis / dysbiosis of the oropharynx I degree in 6.0%, II degree - in 28.0% of patients and III degree - in 66.0% of patients with chronic purulent maxillary sinusitis, characterized by elimination or severe deficiency of autochthonous obligate anaerobic and aerobic bacteria (bacteria of the genus Bifidobacterium, Lactobacillus, Streptococcus (S.salivarius, S.sanguis, S.mitis, S.mutans, L.lactis, M.luteus) biotope contamination by pathogenic and conditionally pathogenic S.pneumoniae, S.pyogenes, H.influenzae, M.catarrhalis, E.coli, E.coli Hly+, Enterobacter freundii., Klebsiella oxytoca, S.aureus and others.

Blowout fracture-associated orbital cellulitis progressing to panophthalmitis: a case report

Background Parvimonas micra is known as a causative agent of chronic periodontal disease. This Gram-positive obligate anaerobic coccus was cultured from the ocular surface of blowout fracture-related orbital cellulitis progressing to panophthalmitis. Case presentation The patient was a woman in her fifties who had panic disorder and subsequently was a victim of domestic violence. These factors led to delayed consultation. At the initial visit to an ophthalmologist, the ocular surface of the right eye was covered with pus. Swelling of the upper and lower eyelids prevented the eyelid from closing and exophthalmos, severe corneal ulcer, panophthalmitis, and no light perception were observed. Head computed tomography revealed an old blowout fracture and chronic sinusitis with orbital cellulitis. P. micra were isolated from culture of pus samples from the sinus and from the ocular surface. Conclusions There is a possibility that P. micra invaded the orbit via the fragile bony site and caused orbital cellulitis, severe corneal ulcer, and panophthalmitis that required enucleation. In cases of coexisting old blowout fracture and chronic sinusitis, the chronic sinusitis should be treated as quickly as possible.

The facultative human oral pathogen Prevotella histicola in equine cheek tooth apical/ periapical infection: a case report

Background Prevotella histicola is a facultative oral pathogen that under certain conditions causes pathologies such as caries and periodontitis in humans. Prevotella spp. also colonize the oral cavity of horses and can cause disease, but P. histicola has not yet been identified. Case presentation A 12-year-old Tinker mare was referred to the clinic for persistent, malodorous purulent nasal discharge and quidding. Conservative antibiotic (penicillin), antiphlogistic (meloxicam), and mucolytic (dembrexine-hydrochloride) treatment prior to referral was unsuccessful and symptoms worsened. Oral examination, radiography, sino-/ rhinoscopy, and standing computed tomography revealed severe apical/ periapical infection of the upper cheek tooth 209 with accompanying unilateral sinonasal inflammation and conchal necrosis. The tooth exhibited extensive subocclusal mesial infundibular cemental hypoplasia and caries, and an occlusal fissure fracture. After mechanical debridement and thermoplastic resin filling of the spacious subocclusal carious infundibular lesion, the tooth was extracted intraorally. The sinusitis and conchal necrosis were treated transendoscopically. Selective bacteriological swab cultures of affected tooth roots and subsequent matrix-assisted laser desorption ionization-time of flight mass spectrometry showed an infection with the obligate anaerobic, Gram-negative bacterium P. histicola. Surgical intervention and adapted antibiotic therapy led to normal healing without complications. Conclusions This study provides the first documented case of dental infection in a horse caused by P. histicola at once indicating necessity of more sufficient microbiological diagnostics and targeted antibiotic treatment in equine dental practice. This finding is also conducive to understand species-specific Prevotella diversity and cross-species distribution.

Impact of the gut microecology on Campylobacter presence revealed by comparisons of the gut microbiota from chickens raised on litter or in individual cages

Background Poultry is the major reservoir of Campylobacter that contributes to human campylobacteriosis and threatens food safety. Litter contact has been linked to Campylobacter colonization, but the gut microecological impact underlying this link remains not fully clear. Here, we sought to investigate the impact of the gut microecology on the presence of Campylobacter by examining the microbiota in the duodenum, jejunum, ileum, ceca, and feces from chickens raised on commercial litter and in individual cages at 0–57 days of age. Results Through litter contact, the presence of Campylobacter was found to benefit from microecological competition among Lactobacillus, Helicobacter, and genera that are halotolerant and aerobic or facultatively anaerobic in the upper intestine, such as Corynebacterium and Brachybacterium. The presence was also promoted by the increased abundance in obligate anaerobic fermentation microbes, especially members of the orders Clostridiales and Bacteroidales. The longitudinal analysis supported the vertical or pseudo-vertical transmission but suggested that colonization might occur immensely at 7–28 days of age. We observed a host genetic effect on the gut microecology, which might lead to increased heterogeneity of the microecological impact on Campylobacter colonization. Conclusions The findings advance the understanding of the gut microecological impact on Campylobacter presence in the chicken gut under conditions of litter contact and suggest that manipulations of the gut microecology, as well as the microbes identified in the Campylobacter association networks, might be important for the development of intervention strategies.

Anaerosporobacter faecicola sp. nov. isolated from faeces of Korean cow

A novel bacterial isolate designated as strain AGMB01083T was isolated from Korean cow faeces deposited in the National Institute of Animal Science (Wanju, Republic of Korea). The bacterium is obligate anaerobic, Gram-strain-positive, and motile. Cells are straight or curved rod-shaped, flagella and spores are observed. Growth occurs between 20–40 °C (temperature optimum of 35 °C), at pH 7–9 (pH optimum of 7), and in the presence of 0.5–1.0 % (w/v) NaCl. Based on the 16S rRNA gene sequence analysis, the strain belongs to the genus Anaerosporobacter and is most closely related to A. mobilis HY-37-4T (=KCTC5027T, similarity, 95.7 %). The DNA G+C content is 36.2 mol%, determined by the whole-genome sequence. The average nucleotide identity value between strain AGMB01083T and strain A. mobilis HY-37-4T is 75.5 %, below the interspecies identity threshold value. The major cellular fatty acids (>10 %) of strain AGMB01083T are C16 : 0, C16 : 0 dimethyl acetal (DMA), and C16 : 0 3-OH. Based on the phylogenetic, phenotypic, biochemical, chemotaxonomic, and genomic characterization, strain AGMB01083T is proposed to be a novel species, named Anaerosporobacter faecicola, in the genus Anaerosporobacter . The type strain is AGMB01083T (=KCTC 15857T=NBRC 114517T).

IDENTIFIKASI BAKTERI PEREDUKSI SULFAT PADA KAWAH AIR PANAS NIRWANA SUOH LAMPUNG BARAT

Abstrak: Bakteri pereduksi sulfat atau Sulfate-reducing bacteria (SRB) adalah jenis bakteri obligat anaerob kemolitrotof memanfaatkan donor electron H2. Kemampuan SRB mereduksi sulfat menjadi sulfida mampu mengendapkan logam toksik meliputi Cd, Cu, dan Zn sebagai logam sulfida. SRB memerlukan substrat organik seperti asam piruvat yang dihasilkan oleh aktivitas anaerob lainnya. Mekanisme SRB dalam melakukan reduksi sulfat, sulfat digunakan sebagai sumber energi sebagai akseptor elektron dan menggunakan sumber karbon (C) sebagai donor elekton dalam metabolisme dan bahan penyusun sel. Pada kondisi anaerob bahan organik akan berperan sebagai donor elektron. Pembentukan senyawa sulfida melalui proses reduksi yang ditandai oleh penambahan elektron dari bahan organik yang menyebabkan turunnya konsentrasi sulfat dan naiknya pH lingkungan. SRB pada kawah air panas nirwana ini hidup secara anaerob pada suhu lingkungan 600C - 1000C dengan pH 7,4 tingkat kekeruhan air cukup keruh dan kandungan air yang mengandung blerang dengan indikator bau seperti telur busuk dan lingkungan sekitar terdiri dari sedimen batu kapur. Abstract : Sulfate-reducing bacteria (BPS) is a type of chemolithotroph obligate anaerobic bacteria that utilize H2 electron donors. The ability of BPS to reduce sulfate to sulfide is able to precipitate toxic metals including Cd, Cu, and Zn as metal sulfides. BPS requires organic substrates such as pyruvic acid which is produced by other anaerobic activities. The BPS mechanism in reducing sulfate, sulfate is used as an energy source as an electron acceptor and uses a carbon source (C) as an electron donor in metabolism and cell building material. Under anaerobic conditions, organic matter will act as an electron donor. The formation of sulfide compounds through a reduction process is characterized by the addition of electrons from organic matter which causes a decrease in sulfate concentration and an increase in environmental pH. BPS in this nirvana hot spring crater lives anaerobically at an environmental temperature of 600C - 1000C with a pH of 7.4 the level of turbidity of the water is quite cloudy and the water content contains sulfur with an indicator of smell like rotten eggs and the surrounding environment consists of limestone sediments

The oncolytic activity of Clostridium novyi nontoxic spores in breast cancer

Introduction: Hypoxia context is highly specific for tumors and represents a unique niche which is not found elsewhere in the body. Clostridium novyi is an obligate anaerobic bacterium. It has a potential to treat tumors. The aim of this study was to produce the C. novyi nontoxic spores and to investigate its oncolytic effect on breast cancer in mice model. Methods: Primarily, the lethal toxin gene in C. novyi type B was removed. Colonies were isolated using PCR testing. To assure the removal of alpha-toxin, plasmid extraction and in vivo assay were conducted. Next, to treat breast cancer model in different sizes of tumors, a single dose of spores of C. novyi nontoxic was tested. Results: The results denoted that C. novyi nontoxic lost lethal toxin and a­­ppeared to be safe. For smaller than 1000 mm3 tumors, a single dose of C. novyi nontoxic was able to cure 100% of mice bearing breast tumors. Hence the mice remained free of tumor relapse. Tumors larger than 1000 mm3 were not cured by a single dose­ of C. novyi nontoxic treatment. Conclusion: The experiment concluded that the C. novyi nontoxic might be a suitable and safe candidate, a novel therapeutic approach to encounter such hypoxic regions in the center of tumors. Research also showed that bacteriolytic therapy by C. novyi nontoxic could lead to regression in small tumor.