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Clinical Microbiology Reviews Apr 2015Actinomyces israelii has long been recognized as a causative agent of actinomycosis. During the past 3 decades, a large number of novel Actinomyces species have been... (Review)
Review
Actinomyces israelii has long been recognized as a causative agent of actinomycosis. During the past 3 decades, a large number of novel Actinomyces species have been described. Their detection and identification in clinical microbiology laboratories and recognition as pathogens in clinical settings can be challenging. With the introduction of advanced molecular methods, knowledge about their clinical relevance is gradually increasing, and the spectrum of diseases associated with Actinomyces and Actinomyces-like organisms is widening accordingly; for example, Actinomyces meyeri, Actinomyces neuii, and Actinomyces turicensis as well as Actinotignum (formerly Actinobaculum) schaalii are emerging as important causes of specific infections at various body sites. In the present review, we have gathered this information to provide a comprehensive and microbiologically consistent overview of the significance of Actinomyces and some closely related taxa in human infections.
Topics: Actinomyces; Actinomycosis; Anti-Bacterial Agents; Bacterial Typing Techniques; Classification; Humans; Microbial Sensitivity Tests
PubMed: 25788515
DOI: 10.1128/CMR.00100-14 -
Journal of Oral Microbiology 2024organisms reside on mucosal surfaces of the oropharynx and the genitourinary tract. Polymicrobial infections with organisms are increasingly being reported in the... (Review)
Review
organisms reside on mucosal surfaces of the oropharynx and the genitourinary tract. Polymicrobial infections with organisms are increasingly being reported in the literature. Since these infections differ from classical actinomycosis, lacking of specific clinical and imaging findings, slow-growing organisms can be regarded as contaminants or insignificant findings. In addition, only limited knowledge is available about novel species and their clinical relevance. The recent reclassifications have resulted in the transfer of several species to novel genera , , , , or . The spectrum of diseases associated with specific members of and these related genera varies. In human infections, the most common species are Actinomyces , , and , which are typical inhabitants of the mouth, and , , and . In this narrative review, the purpose was to gather information on the emerging role of specific organisms within the and related genera in polymicrobial infections. These include in pulmonary infections, in brain abscesses and infections in the lower respiratory tract, in skin-related infections, in necrotizing fasciitis and skin abscesses, and in infected tissues around prostheses and devices. Increased understanding of the role of and related species in polymicrobial infections could provide improved outcomes for patient care. Key messages Due to the reclassification of the genus, many former species belong to novel genera , , , , or .Some of the species play emerging roles in specific infection types in humans.Increasing awareness of their clinical relevance as an established or a putative pathogen in polymicrobial infections brings about improved outcomes for patient care.
PubMed: 38766462
DOI: 10.1080/20002297.2024.2354148 -
Surgery Journal (New York, N.Y.) Apr 2019Pleural empyema necessitatis caused by is a rare but severe infection. predominantly and represent the second most common pathogen for empyema necessitans after...
Pleural empyema necessitatis caused by is a rare but severe infection. predominantly and represent the second most common pathogen for empyema necessitans after mycobacteria. The incidence is reported in the literature to be 1:300,000. Men are thrice more likely to be affected than women. Pathogenetically, an infection can be triggered by aspiration in immunocompromised individuals which leads to an atelectasis with pneumonitis. In two cases, a 38-year-old construction worker and a 61-year-old woman with ulcerative breast carcinoma, who presented to the local emergency department with a painful swelling of the left chest, diagnostic workup revealed a pleural empyema necessitatis of the left chest. An antibiotic treatment was initiated with piperacillin/tazobactam and sulbactam/ampicillin, respectively. Temporally vacuum-dressing therapy was initiated after surgical debridement. In the course of the procedure, a reconstruction of tissue damage was feasible. The patients were recovered completely and discharged with an oral antibiotic treatment (amoxicillin) for 6 and 12 months, respectively. Thoracic actinomycosis is a relatively uncommon and traditionally chronic, indolent infection secondary to pulmonary infection with . Surgical treatment is generally reserved for cases failing to resolve with antibiotic therapy. Early diagnosis, prompt debridement, and narrow spectrum β-lactam antibiotics can result in complete resolution of infection and good prognosis.
PubMed: 31317069
DOI: 10.1055/s-0039-1693653 -
BMC Microbiology Jul 2020The possibility that smokeless tobacco may contribute to oral carcinogenesis by influencing the oral microbiome has not been explored. This preliminary cross-sectional...
BACKGROUND
The possibility that smokeless tobacco may contribute to oral carcinogenesis by influencing the oral microbiome has not been explored. This preliminary cross-sectional study sought to assess the effect of using shammah, a form of smokeless tobacco prevalent in Arabia, on the tongue microbiome. Tongue scarping samples were obtained from 29 shammah users (SU; 27.34 ± 6.9 years) and 23 shammah non-users (SNU; 27.7 ± 7.19 years) and analyzed with 16S rRNA gene sequencing (V1-V3). Species-level taxonomy assignment of the high-quality, merged reads was obtained using a previously described BLASTn-based algorithm. Downstream analyses were performed with QIIME, LEfSe, and R.
RESULTS
A total of 178 species, belonging to 62 genera and 8 phyla were identified. Genera Streptococcus, Leptotrichia, Actinomyces, Veillonella, Haemophilus, Prevotella and Neisseria accounted for more than 60% of the average microbiome. There were no differences between the two groups in species richness and alpha-diversity, but PCoA showed significant separation (P = 0.015, ANOSIM). LEfSe analysis identified 22 species to be differentially abundant between the SU and SNU. However, only 7 species maintained a false discovery rate of ≤0.2 and could cluster the two groups separately: Rothia mucilaginosa, Streptococcus sp. oral taxon 66, Actinomyces meyeri, Streptococcus vestibularis Streptococcus sanguinis and a potentially novel Veillonella species in association with SU, and Oribacterium asaccharolyticum with SNU.
CONCLUSION
These preliminary results indicate that shammah use induces tongue microbiome changes including enrichment of several species with high acetaldehyde production potential, which warrants further investigation.
Topics: Adult; Bacteria; Case-Control Studies; Cross-Sectional Studies; DNA, Bacterial; DNA, Ribosomal; Humans; Male; Phylogeny; RNA, Ribosomal, 16S; Sequence Analysis, DNA; Tobacco, Smokeless; Tongue; Young Adult
PubMed: 32640977
DOI: 10.1186/s12866-020-01883-8 -
European Heart Journal. Case Reports Jul 2022Purulent bacterial pericarditis (PBP) is a highly lethal infection of the pericardial space that arises as a complication of infective illnesses. Purulent bacterial...
BACKGROUND
Purulent bacterial pericarditis (PBP) is a highly lethal infection of the pericardial space that arises as a complication of infective illnesses. Purulent bacterial pericarditis remains a diagnostic challenge given its non-specific clinical and investigative features and carries exceedingly high mortality rates due to fulminant sepsis and morbidity including constrictive pericarditis in survivors. We present our management of cardiac tamponade and subsequent constrictive pericarditis due to PBP.
CASE SUMMARY
A 53-year-old Caucasian male presented with acute New York Heart Association Class IV dyspnoea and chest discomfort, in the context of multiple hospital presentations over the preceding 8 weeks due to presumed recurrent viral pericarditis. On this admission, initial transthoracic echocardiography (TTE) demonstrated a large asymmetric pericardial effusion for which he underwent urgent pericardiocentesis. Serial TTE post-pericardiocentesis, however, demonstrated effusion re-accumulation and effusive-constrictive pericarditis, confirmed on cardiac magnetic resonance imaging. Fluid culture was positive for . He was diagnosed with PBP, but his condition deteriorated despite appropriate intravenous antibiotic therapy, necessitating semi-urgent surgical pericardiectomy. He recovered well and was discharged on Day 10 post-operatively.
DISCUSSION
Unlike uncomplicated acute viral or idiopathic pericarditis, PBP portends a very poor prognosis if unrecognized and untreated. Diagnostic challenges persist given its rarity in modern clinical practice; however, PBP should be considered in cases of seemingly recurrent pericarditis. Multi-modal cardiac imaging and careful analysis of pericardial fluid including cultures and lactate dehydrogenase/serum ratios may assist in earlier recognition. In this case, source control and symptom relief were achieved only with combined intravenous antibiotics, surgical evacuation, and pericardiectomy.
PubMed: 35821970
DOI: 10.1093/ehjcr/ytac260 -
BMC Neurology Nov 2023Brain abscesses can occur when suppurative, bacterial or protozoan infections spread to the brain. Here, we report a rare case of Actinomyces meyeri-induced brain...
BACKGROUND
Brain abscesses can occur when suppurative, bacterial or protozoan infections spread to the brain. Here, we report a rare case of Actinomyces meyeri-induced brain abscess in a pregnant woman.
CASE PRESENTATION
We present the case of a 38-years-old primipara admitted to the emergency department at our hospital with a 4-day history of fever and vomiting. The symptoms worsened rapidly during the 8 h prior to admission, and the patient experienced a sudden loss of consciousness 4 h before arrival to the unit. Brain magnetic resonance imaging revealed abnormal signals in the right parietal-temporal lobe, suggesting the possibility of abscess rupture into the ventricle and sulcus. Right lateral ventricle compression and midline structure deviation to the left were noted. A right temporal-occipital mass with midline shift was detected. Emergency procedures were promptly performed, including craniotomy, removal of the right temporal-occipital mass, decompressive craniectomy, implantation of an intracranial pressure monitoring device, and external ventricular drainage. Cerebrospinal fluid culture indicated infection with Actinomyces meyeri. After administration of antibiotics, including linezolid and meropenem injections, along with treatments to decrease intracranial pressure, the patient's vital signs stabilized. However, the patient developed hydrocephalus, requiring placement of a hydrocephalus shunt several months later. Throughout this period, the patient remained in a coma vigil state, and labor was induced for the fetus.
CONCLUSIONS
Although the patient did not present with any apparent predisposing causes for brain abscess, a scout view of CT revealed dental caries. In addition, the occurrence of the brain abscess may have been influenced by the hormonal changes during pregnancy, including increased secretion of estrogen and progesterone, as well as decreased immune function. Early diagnosis and intervention are crucial in such cases. Therefore, it is recommended to seek early medical attention if symptoms such as fever, vomiting, and changes in mental state occur during pregnancy, as the prognosis for both the mother and infant is poor once the abscess ruptures.
Topics: Pregnancy; Female; Humans; Adult; Dental Caries; Brain Abscess; Hydrocephalus; Vomiting
PubMed: 37950157
DOI: 10.1186/s12883-023-03453-7 -
IDCases 2021We report the case of a man with intense cough for several months and a few days of severe dyspnea. A massive pleural empyema due to was diagnosed by radiological,...
We report the case of a man with intense cough for several months and a few days of severe dyspnea. A massive pleural empyema due to was diagnosed by radiological, microbiological and thoracoscopic means. Pleural infections caused by this anaerobic bacterium are very rare and should be considered when risk factors like male gender, chronic alcohol abuse, and poor oral hygiene are present. Penicillin-based antibiotic treatment and surgical decortication led to recovery.
PubMed: 34584845
DOI: 10.1016/j.idcr.2021.e01278 -
Case Reports in Infectious Diseases 2015Actinomyces meyeri is an uncommon cause of human actinomycosis. Here, we report a rare case of empyema caused by A. meyeri. A 49-year-old male presented with a history...
Actinomyces meyeri is an uncommon cause of human actinomycosis. Here, we report a rare case of empyema caused by A. meyeri. A 49-year-old male presented with a history of 10 days of dyspnea and chest pain. A large amount of loculated pleural effusion was present on the right side and multiple lung nodules were documented on radiological studies. A chest tube was inserted and purulent pleural fluid was drained. A. meyeri was isolated in anaerobic cultures of the pleural fluid. The infection was alleviated in response to treatment with intravenous penicillin G (20 million IU daily) and oral amoxicillin (500 mg every 8 hours) for 4 months, demonstrating that short-term antibiotic treatment was effective.
PubMed: 26124969
DOI: 10.1155/2015/291838 -
Orphanet Journal of Rare Diseases Jun 2023CNS actinomycosis is a rare chronic suppurative infection with non-specific clinical features. Diagnosis is difficult due to its similarity to malignancy, nocardiosis... (Review)
Review
BACKGROUND
CNS actinomycosis is a rare chronic suppurative infection with non-specific clinical features. Diagnosis is difficult due to its similarity to malignancy, nocardiosis and other granulomatous diseases. This systematic review aimed to evaluate the epidemiology, clinical characteristics, diagnostic modalities and treatment outcomes in CNS actinomycosis.
METHODS
The major electronic databases (PubMed, Google Scholar, and Scopus) were searched for the literature review by using distinct keywords: "CNS" or "intracranial" or "brain abscess" or "meningitis" OR "spinal" OR "epidural abscess" and "actinomycosis." All cases with CNS actinomycosis reported between January 1988 to March 2022 were included.
RESULTS
A total of 118 cases of CNS disease were included in the final analysis. The mean age of patients was 44 years, and a significant proportion was male (57%). Actinomycosis israelii was the most prevalent species (41.5%), followed by Actinomyces meyeri (22.6%). Disseminated disease was found in 19.5% of cases. Most commonly involved extra-CNS organs are lung (10.2%) and abdomen (5.1%). Brain abscess (55%) followed by leptomeningeal enhancement (22%) were the most common neuroimaging findings. Culture positivity was found in nearly half of the cases (53.4%). The overall case-fatality rate was 11%. Neurological sequelae were present in 22% of the patients. On multivariate analysis, patients who underwent surgery with antimicrobials had better survival (adjusted OR 0.14, 95% CI 0.04-0.28, p value 0.039) compared to those treated with antimicrobials alone.
CONCLUSION
CNS actinomycosis carries significant morbidity and mortality despite its indolent nature. Early aggressive surgery, along with prolonged antimicrobial treatment is vital to improve outcomes.
Topics: Humans; Male; Adult; Abscess; Actinomycosis; Central Nervous System Diseases; Treatment Outcome
PubMed: 37269006
DOI: 10.1186/s13023-023-02744-z -
Respiratory Medicine Case Reports 2021An eighty-three-year-old man suffered from cough, right chest pain, and progressive dyspnea for sixteen days. He had hypoxemia, high white blood cells and C-reactive...
An eighty-three-year-old man suffered from cough, right chest pain, and progressive dyspnea for sixteen days. He had hypoxemia, high white blood cells and C-reactive protein, and moderate right-sided pleural effusion on radiographic imaging. A pleural fluid examination revealed exudate. He was diagnosed with pleural infection and treated with intravenous ampicillin/sulbactam. On the second day of hospitalization, the treatment was changed to levofloxacin and clindamycin due to drug eruption. He improved gradually and was prescribed only oral levofloxacin on the eighteenth day of hospitalization. However, improvements in inflammation and imaging findings were poor. resistant to fluoroquinolones was cultured from a pleural effusion sample on the twenty-sixth day of hospitalization. The treatment was changed to oral clindamycin, and his medical condition subsequently improved. We reviewed twenty-eight patients with pleural infection and thirty-eight patients with other pleural infection phenotypes from our hospital and published case reports. pleural infection is a long-term process and results in a large amount of pleural effusion compared to other pleural infection phenotypes. These results might be related to the fact that is a slow-growing organism.
PubMed: 34745867
DOI: 10.1016/j.rmcr.2021.101530