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Actinomycetales infections and treatment
Research Guide
What is Actinomycetales infections and treatment?
Actinomycetales infections and treatment refers to the clinical management, antimicrobial susceptibility testing, and microbiological characterization of infections caused by Actinomycetales bacteria such as Nocardia spp., responsible for nocardiosis, actinomycosis, and mycetoma.
The field encompasses 57,861 published works on the clinical features, epidemiology, diagnosis, and treatment of infections by Nocardia spp. and related Actinomycetales. "Susceptibility Testing of Mycobacteria, Nocardiae, and Other Aerobic Actinomycetes" (Woods et al., 2011) provides standardized methods for testing antimicrobial susceptibility of Nocardia and aerobic actinomycetes. Characterization methods for Streptomyces species, as detailed in "Methods for characterization of Streptomyces species" (Shirling and Gottlieb, 1966), support taxonomic identification relevant to infection diagnostics.
Topic Hierarchy
Research Sub-Topics
Nocardiosis in Transplant Recipients
This sub-topic examines the epidemiology, risk factors, clinical presentations, and outcomes of Nocardia infections specifically in solid organ and hematopoietic stem cell transplant patients. Researchers investigate immunosuppressive regimens, diagnostic delays, and tailored therapeutic approaches to improve survival rates.
Antimicrobial Susceptibility of Nocardia Species
This area focuses on in vitro susceptibility patterns, resistance mechanisms, and breakpoints for antibiotics like trimethoprim-sulfamethoxazole, linezolid, and carbapenems against diverse Nocardia spp. Studies develop standardized testing methods and monitor emerging multidrug resistance.
Genomic Sequencing of Actinomycetales Pathogens
Researchers perform whole-genome sequencing to resolve taxonomy, identify virulence factors, and track outbreaks of Nocardia, Actinomyces, and related genera. This includes comparative genomics for phylogenetic classification and antimicrobial resistance gene prediction.
Epidemiology of Actinomycosis and Mycetoma
This sub-topic covers global incidence, geographic distribution, environmental reservoirs, and transmission dynamics of Actinomyces and eumycetoma-causing Actinomycetales. Studies analyze host predispositions and secular trends in endemic regions.
Clinical Management of Nocardia Infections
Focused on diagnostic algorithms, duration of therapy, adjunctive surgery, and prognostic factors for pulmonary, disseminated, and CNS nocardiosis. Researchers evaluate randomized trials and observational cohorts for evidence-based guidelines.
Why It Matters
Actinomycetales infections like nocardiosis affect transplant recipients and immunocompromised patients, requiring precise susceptibility testing for effective treatment. "Susceptibility Testing of Mycobacteria, Nocardiae, and Other Aerobic Actinomycetes" (Woods et al., 2011) establishes protocols for testing Nocardia spp. and aerobic actinomycetes, enabling clinicians to select appropriate antimicrobials based on in vitro results. This is critical for managing outcomes in high-risk populations, as seen in studies of Nocardia taxonomy and species like Nocardia coeliaca in "Nocardia coeliaca, Nocardia autotrophica, and the Nocardin Strain" (Gordon et al., 1974). Accurate taxonomy from works like "Proposal for a New Hierarchic Classification System, Actinobacteria classis nov." (Stackebrandt et al., 1997) ensures proper identification, directly impacting treatment efficacy in clinical settings.
Reading Guide
Where to Start
"Susceptibility Testing of Mycobacteria, Nocardiae, and Other Aerobic Actinomycetes" (Woods et al., 2011) is the starting point for beginners, as it directly addresses practical testing methods for Nocardia infections and treatment, central to clinical management.
Key Papers Explained
"Susceptibility Testing of Mycobacteria, Nocardiae, and Other Aerobic Actinomycetes" (Woods et al., 2011) builds on taxonomic foundations from "Methods for characterization of Streptomyces species" (Shirling and Gottlieb, 1966) and "Numerical Classification of Streptomyces and Related Genera" (Williams et al., 1983), which provide strain identification techniques. These connect to modern classification in "Proposal for a New Hierarchic Classification System, Actinobacteria classis nov." (Stackebrandt et al., 1997) via 16S rRNA analysis, and extend to Nocardia specifics in "Nocardia coeliaca, Nocardia autotrophica, and the Nocardin Strain" (Gordon et al., 1974). "Proposed minimal standards for the use of genome data for the taxonomy of prokaryotes" (Chun et al., 2018) integrates genome data to refine these hierarchies for infection diagnostics.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current frontiers emphasize genome-based taxonomy standards from "Proposed minimal standards for the use of genome data for the taxonomy of prokaryotes" (Chun et al., 2018) and updates to nomenclature resources in "List of Prokaryotic names with Standing in Nomenclature (LPSN) moves to the DSMZ" (Parte et al., 2020), focusing on refining Nocardia species identification for susceptibility testing.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Methods for characterization of Streptomyces species | 1966 | International Journal ... | 5.7K | ✕ |
| 2 | Practical streptomyces genetics | 2000 | Medical Entomology and... | 3.9K | ✕ |
| 3 | The IASLC Lung Cancer Staging Project: Proposals for the Revis... | 2007 | Journal of Thoracic On... | 3.7K | ✕ |
| 4 | Complete genome sequence of the model actinomycete Streptomyce... | 2002 | Nature | 3.2K | ✕ |
| 5 | Proposed minimal standards for the use of genome data for the ... | 2018 | INTERNATIONAL JOURNAL ... | 2.9K | ✓ |
| 6 | List of Prokaryotic names with Standing in Nomenclature (LPSN)... | 2020 | INTERNATIONAL JOURNAL ... | 1.9K | ✓ |
| 7 | Proposal for a New Hierarchic Classification System, Actinobac... | 1997 | International Journal ... | 1.7K | ✕ |
| 8 | Numerical Classification of Streptomyces and Related Genera | 1983 | Microbiology | 1.3K | ✕ |
| 9 | Nocardia coeliaca, Nocardia autotrophica, and the Nocardin Strain | 1974 | International Journal ... | 1.3K | ✕ |
| 10 | Susceptibility Testing of Mycobacteria, Nocardiae, and Other A... | 2011 | — | 1.2K | ✕ |
Frequently Asked Questions
What methods are used for susceptibility testing of Nocardia?
"Susceptibility Testing of Mycobacteria, Nocardiae, and Other Aerobic Actinomycetes" (Woods et al., 2011) outlines standardized protocols for in vitro testing of Nocardia spp. and aerobic actinomycetes. These methods guide selection of effective antimicrobials against infections like nocardiosis. Testing ensures tailored therapy for patient populations such as transplant recipients.
How are Streptomyces species characterized for taxonomic purposes?
"Methods for characterization of Streptomyces species" (Shirling and Gottlieb, 1966) describes techniques used in the International Streptomyces Project for emending descriptions of type strains. These include morphological, physiological, and biochemical tests. Such characterization aids in identifying Actinomycetales relevant to infections.
What is the taxonomic classification of Actinobacteria?
"Proposal for a New Hierarchic Classification System, Actinobacteria classis nov." (Stackebrandt et al., 1997) proposes a hierarchic structure based on 16S rRNA analysis for actinomycetes between genus and class levels. This system refines the taxonomy of pathogens like Nocardia. It supports accurate identification in clinical microbiology.
How does numerical classification apply to Streptomyces and related genera?
"Numerical Classification of Streptomyces and Related Genera" (Williams et al., 1983) analyzed 475 strains using 139 unit characters and clustering algorithms. This approach grouped Streptomyces type cultures and other actinomycetes by similarity. It provides a foundation for distinguishing infection-causing species.
What role does genome sequencing play in Actinomycetales taxonomy?
"Proposed minimal standards for the use of genome data for the taxonomy of prokaryotes" (Chun et al., 2018) sets quality standards for genome sequences in prokaryote taxonomy. These standards apply to Actinomycetales like Nocardia for reliable classification. Genome data enhances diagnostic precision in infections.
What are key Nocardia species and their characteristics?
"Nocardia coeliaca, Nocardia autotrophica, and the Nocardin Strain" (Gordon et al., 1974) reclassifies strains like ATCC 17041 as Nocardia coeliaca, originally Mycobacterium coeliacum. It links these to antibiotic production like nocardin. Such taxonomy informs treatment of nocardiosis.
Open Research Questions
- ? How do variations in antimicrobial susceptibility patterns among Nocardia species affect treatment outcomes in transplant recipients?
- ? What genomic features distinguish pathogenic Actinomycetales from non-pathogenic Streptomyces in clinical infections?
- ? Can standardized susceptibility testing protocols be optimized for rapid diagnosis of actinomycosis and mycetoma?
- ? How does 16S rRNA-based taxonomy evolve with whole-genome sequencing for Nocardia epidemiology?
- ? What are the epidemiological risk factors for Nocardia infections in diverse patient populations?
Recent Trends
The field includes 57,861 works with a focus on Nocardia taxonomy and susceptibility, as evidenced by ongoing nomenclature updates in "List of Prokaryotic names with Standing in Nomenclature (LPSN) moves to the DSMZ" (Parte et al., 2020).
Standards for genome data in taxonomy advanced with "Proposed minimal standards for the use of genome data for the taxonomy of prokaryotes" (Chun et al., 2018), supporting precise identification of infection-causing Actinomycetales.
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