The intracellular phase of extracellular respiratory tract bacterial pathogens and its role on pathogen-host interactions during infection

2021 ◽  
Vol 34 (3) ◽  
pp. 197-205
Author(s):  
Yanina Lamberti ◽  
Kristin Surmann
Keyword(s):  
Respiratory Tract ◽  
Bacterial Pathogens ◽  
Host Interactions

Urinary Tract Infection Caused By Bacterial Pathogens of The Respiratory Tract In Children

2022 ◽  
Author(s):  
Yoko Takahashi ◽  
Takanori Funaki ◽  
Akira Ishiguro ◽  
Isao Miyairi
Keyword(s):  
Urinary Tract Infection ◽  
Urinary Tract ◽  
Tract Infection ◽  
Respiratory Tract ◽  
Disease Surveillance ◽  
Bacterial Pathogens ◽  
Tertiary Care ◽  
Laboratory Data ◽  
Urinary Tract Abnormalities ◽  
Vesicocutaneous Fistula

Abstract Urinary tract infection (UTI) caused by bacterial pathogens of the respiratory tract such as Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis is rare and little is known about their characteristics and potential host risk factors. We conducted a retrospective descriptive study on pediatric UTI due to S. pneumoniae, Haemophilus spp., or M. catarrhalis at a tertiary-care pediatric hospital. Pediatric patients with diagnosed UTI between 2002 and 2020 were included. Patient demographics, laboratory data, and microbiological findings were extracted from their electronic medical records and the infectious disease surveillance system. Among 46,332 urine samples, 76 bacteriuria (0.16%) and 22 UTI (0.05%) events due to the targeted species were identified (S. pneumoniae [n=7] and Haemophilus spp. [n=15]). Of the patients, 17 (85%) had underlying urinary tract abnormalities and 13 (60%) had vesicocutaneous fistula. All the UTI episodes caused by S. pneumoniae and Haemophilus spp. occurred after cystostomy. All the patients had satisfactory clinical outcomes.Conclusion: Although S. pneumoniae and Haemophilus spp. are rare causes of UTI in children, they could be the true causative bacteria of UTI even when detected in urine specimens, particularly in the patients with urinary tract abnormalities and vesicocutaneous fistula.

Polyamines in the virulence of bacterial pathogens of respiratory tract

2020 ◽  
Author(s):  
Rajashri Banerji ◽  
Poonam Kanojiya ◽  
Amrita Patil ◽  
Sunil D. Saroj
Keyword(s):  
Respiratory Tract ◽  
Bacterial Pathogens

scholarly journals Burden of multidrug resistant respiratory pathogens in intensive care units of tertiary care hospital

2019 ◽  
Vol 10 (2) ◽  
pp. 14-19 ◽  
Author(s):  
Dharm Raj Bhatta ◽  
Deependra Hamal ◽  
Rajani Shrestha ◽  
Supram HS ◽  
Pushpanjali Joshi ◽  
...  
Keyword(s):  
Intensive Care ◽  
Respiratory Tract ◽  
Intensive Care Units ◽  
Lower Respiratory Tract ◽  
Respiratory Tract Infections ◽  
Bacterial Pathogens ◽  
Multidrug Resistant ◽  
Lower Respiratory Tract Infections ◽  
Acinetobacter Species ◽  
Tract Infections

Background: Lower respiratory tract infections are one of the most common infections among the patients in Intensive Care Units (ICUs). Admission in ICUs and use of life supporting devices increase the risk of infection with multidrug resistant pathogens. Aims and Objectives: This study was aimed to determine the prevalence and antibiograms ofthe bacterial pathogens causing lower respiratory tract infectionsamong patients of ICUs. Materials and Methods: A total of 184 specimens from patients admitted in ICUswith lower respiratory tract infections were included in this study. Isolation, identification and antibiotic susceptibility testing of the isolates was performed by standard microbiological techniques. Carbapenamase detection was performed by modified Hodge test method.Detection of metallo beta lactamase (MBL) was tested by imipenem and imipenem/EDTA disc. Detection of Klebsiellapneumoniaecarbapenamase (KPC) was performed by imipenem and imipenem/phenyl boronic acid. Results: Out of 184 samples, 131 showed significant growth of bacterial pathogens. Acinetobacter species (42.6%), Staphylococcus aureus (16.9%) and Pseudomonasaeruginosa(13.9%)were the three most common isolates. Out of 22 imipenem resistant isolates of Acientobacter species, 9 were KPC producer, 4 were MBL producers and 3 isolates were positive for MBL and KPC both. Among the Acinetobacter species, 5.1% isolates were resistant to tigecycline and colistin. One isolate of Pseudomonas aeruginosa was positive for MBL. Conclusions:High prevalence of multidrug resistant bacteria in ICUs was recorded. Gram negative bacilli were predominantly associated with LRTI among ICU patients;Acinetobacterspecies being most common isolate. Detection of carbapenamase among the Acinetobacterand emergence of tigecycline resistancelimits the therapeutic options.Regular monitoring of such resistant isolates would be important for managing infection control in critical units.

scholarly journals Discovery of Species-unique Peptide Biomarkers of Bacterial Pathogens by Tandem Mass Spectrometry-based Proteotyping

2020 ◽  
Vol 19 (3) ◽  
pp. 518-528 ◽  
Author(s):  
Roger Karlsson ◽  
Annika Thorsell ◽  
Margarita Gomila ◽  
Francisco Salvà-Serra ◽  
Hedvig E. Jakobsson ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Infectious Diseases ◽  
Respiratory Tract ◽  
Respiratory Tract Infections ◽  
Clinical Laboratory ◽  
Bacterial Pathogens ◽  
Clinical Samples ◽  
Tandem Ms ◽  
Adequate Treatment ◽  
Tract Infections

Mass spectrometry (MS) and proteomics offer comprehensive characterization and identification of microorganisms and discovery of protein biomarkers that are applicable for diagnostics of infectious diseases. The use of biomarkers for diagnostics is widely applied in the clinic and the use of peptide biomarkers is increasingly being investigated for applications in the clinical laboratory. Respiratory-tract infections are a predominant cause for medical treatment, although, clinical assessments and standard clinical laboratory protocols are time-consuming and often inadequate for reliable diagnoses. Novel methods, preferably applied directly to clinical samples, excluding cultivation steps, are needed to improve diagnostics of infectious diseases, provide adequate treatment and reduce the use of antibiotics and associated development of antibiotic resistance. This study applied nano-liquid chromatography (LC) coupled with tandem MS, with a bioinformatics pipeline and an in-house database of curated high-quality reference genome sequences to identify species-unique peptides as potential biomarkers for four bacterial pathogens commonly found in respiratory tract infections (RTIs): Staphylococcus aureus; Moraxella catarrhalis; Haemophilus influenzae and Streptococcus pneumoniae. The species-unique peptides were initially identified in pure cultures of bacterial reference strains, reflecting the genomic variation in the four species and, furthermore, in clinical respiratory tract samples, without prior cultivation, elucidating proteins expressed in clinical conditions of infection. For each of the four bacterial pathogens, the peptide biomarker candidates most predominantly found in clinical samples, are presented. Data are available via ProteomeXchange with identifier PXD014522. As proof-of-principle, the most promising species-unique peptides were applied in targeted tandem MS-analyses of clinical samples and their relevance for identifications of the pathogens, i.e. proteotyping, was validated, thus demonstrating their potential as peptide biomarker candidates for diagnostics of infectious diseases.

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