scholarly journals Incorporation of Phosphorylcholine into the Lipooligosaccharide of Nontypeable Haemophilus influenzae Does Not Correlate with the Level of Biofilm FormationIn Vitro

2014 ◽  
Vol 82 (4) ◽  
pp. 1591-1599 ◽  
Author(s):  
Carmen Puig ◽  
Sara Marti ◽  
Peter W. M. Hermans ◽  
Marien I. de Jonge ◽  
Carmen Ardanuy ◽  
...  
Keyword(s):  
Chronic Obstructive Pulmonary Disease ◽  
Haemophilus Influenzae ◽  
Pulmonary Disease ◽  
Otitis Media ◽  
Middle Ear ◽  
Biofilm Formation ◽  
Community Acquired Pneumonia ◽  
Chronic Obstructive ◽  
Obstructive Pulmonary Disease ◽  
Middle Ear Fluid

ABSTRACTNontypeableHaemophilus influenzae(NTHi) is an opportunistic pathogen that causes otitis media in children and community-acquired pneumonia or exacerbations of chronic obstructive pulmonary disease in adults. A large variety of studies suggest that biofilm formation by NTHi may be an important step in the pathogenesis of this bacterium. The objective of this report was to determine the relationship between the presence of phosphorylcholine in the lipooligosaccharide of NTHi and the level of biofilm formation. The study was performed on 111 NTHi clinical isolates collected from oropharyngeal samples of healthy children, middle ear fluid of children with otitis media, and sputum samples of patients with chronic obstructive pulmonary disease or community-acquired pneumonia. NTHi clinical isolates presented a large variation in the level of biofilm formation in a static assay and phosphorylcholine content. Isolates collected from the oropharynx and middle ear fluid of children tended to have more phosphorylcholine and made denser biofilms than isolates collected from sputum samples of patients with chronic obstructive pulmonary disease or community-acquired pneumonia. No correlation was observed between biofilm formation and the presence of phosphorylcholine in the lipooligosaccharide for either planktonic or biofilm growth. This lack of correlation was confirmed by abrogating phosphorylcholine incorporation into lipooligosaccharide throughlicAgene deletion, which had strain-specific effects on biofilm formation. Altogether, we present strong evidence to conclude that there is no correlation between biofilm formation in a static assay and the presence of phosphorylcholine in lipooligosaccharide in a large collection of clinical NTHi isolates collected from different groups of patients.

scholarly journals Non-typeable Haemophilus influenzae isolates from patients with chronic obstructive pulmonary disease contain new phase-variable modA methyltransferase alleles controlling phasevarions

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
John M. Atack ◽  
Timothy F. Murphy ◽  
Melinda M. Pettigrew ◽  
Kate L. Seib ◽  
Michael P. Jennings
Keyword(s):  
Chronic Obstructive Pulmonary Disease ◽  
Haemophilus Influenzae ◽  
Pulmonary Disease ◽  
Middle Ear ◽  
Chronic Obstructive ◽  
Phase Variable ◽  
Obstructive Pulmonary Disease ◽  
Bacterial Gene ◽  
Ear Infections ◽  
New Phase

Abstract Phasevarions (phase-variable regulons) are emerging as an important area of bacterial gene regulation. Many bacterial pathogens contain phasevarions, with gene expression controlled by the phase-variable expression of DNA methyltransferases via epigenetic mechanisms. Non-typeable Haemophilus influenzae (NTHi) contains the phase-variable methyltransferase modA, of which multiple allelic variants exist (modA1-21). We have previously demonstrated 5 of 21 these modA alleles are overrepresented in NTHi strains isolated from children with middle ear infections. In this study we investigated the modA allele distribution in NTHi strains isolated from patients with chronic obstructive pulmonary disease, COPD. We demonstrate that the distribution of modA alleles in a large panel of COPD isolates is different to the distribution seen in middle ear infections, suggesting different modA alleles may provide distinct advantages in the differing niches of the middle ear and COPD airways. We also identified two new phase-variable modA alleles – modA15 and modA18 – and demonstrate that these alleles methylate distinct DNA sequences and control unique phasevarions. The modA15 and modA18 alleles have only been observed in COPD isolates, indicating that these two alleles may be markers for isolates likely to cause exacerbations of COPD.

scholarly journals Influenza in Malaysian adult patients hospitalized with community-acquired pneumonia, acute exacerbation of chronic obstructive pulmonary disease or asthma: a multicenter, active surveillance study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yong Kek Pang ◽  
Ahmad Izuanuddin Ismail ◽  
Yoke Fun Chan ◽  
Adelina Cheong ◽  
Yoong Min Chong ◽  
...  
Keyword(s):  
Chronic Obstructive Pulmonary Disease ◽  
Pulmonary Disease ◽  
Acute Exacerbation ◽  
Active Surveillance ◽  
Community Acquired Pneumonia ◽  
Surveillance Study ◽  
Chronic Obstructive ◽  
Obstructive Pulmonary Disease ◽  
High Dependency ◽  
Increased Risk

Abstract Background Available data on influenza burden across Southeast Asia are largely limited to pediatric populations, with inconsistent findings. Methods We conducted a multicenter, hospital-based active surveillance study of adults in Malaysia with community-acquired pneumonia (CAP), acute exacerbation of chronic obstructive pulmonary disease (AECOPD) and acute exacerbation of asthma (AEBA), who had influenza-like illness ≤10 days before hospitalization. We estimated the rate of laboratory-confirmed influenza and associated complications over 13 months (July 2018–August 2019) and described the distribution of causative influenza strains. We evaluated predictors of laboratory-confirmed influenza and severe clinical outcomes using multivariate analysis. Results Of 1106 included patients, 114 (10.3%) were influenza-positive; most were influenza A (85.1%), with A/H1N1pdm09 being the predominant circulating strain during the study following a shift from A/H3N2 from January–February 2019 onwards. In multivariate analyses, an absence of comorbidities (none versus any comorbidity [OR (95%CI), 0.565 (0.329–0.970)], p = 0.038) and of dyspnea (0.544 (0.341–0.868)], p = 0.011) were associated with increased risk of influenza positivity. Overall, 184/1106 (16.6%) patients were admitted to intensive care or high-dependency units (ICU/HDU) (13.2% were influenza positive) and 26/1106 (2.4%) died (2.6% were influenza positive). Males were more likely to have a severe outcome (ICU/HDU admission or death). Conclusions Influenza was a significant contributor to hospitalizations associated with CAP, AECOPD and AEBA. However, it was not associated with ICU/HDU admission in this population. Study registration, NMRR ID: NMRR-17-889-35,174.

scholarly journals POSSIBILITIES OF USING MINIINVASIVE CATHETER TECHNOLOGIES IN THE TREATMENT OF LUNG BLEEDING

2019 ◽  
Vol 6 ◽  
pp. 41-48
Author(s):  
Kateryna Ponomarova
Keyword(s):  
Chronic Obstructive Pulmonary Disease ◽  
Surgical Treatment ◽  
Pulmonary Disease ◽  
High Efficiency ◽  
Bronchial Artery ◽  
Pulmonary Hemorrhage ◽  
Community Acquired Pneumonia ◽  
Chronic Obstructive ◽  
Bronchial Arteries ◽  
Obstructive Pulmonary Disease

Aim – improve the results of the treatment of patients with pulmonary bleeding through widespread use of endovascular surgery methods for hemostasis. Materials and methods. Method of endovascular embolization of bronchial arteries is widely used in our clinic SI «Zaycev V. T. Institute of General and Emergency surgery of NAMS of Ukraine» not only as independent surgery in patients with LB, but also as way of preparation of patients with lung bleeding for planned thorax surgery. The most of the often spread nosological forms complicated by bleeding in our research were polycystic lung disease, chronic obstructive pulmonary disease, bronchiectasis disease, community-acquired pneumonia. Indications to the сatheter embolization procedure of bronchial arteries are the following: conservative treatment failure, hemoptysis in patients with bilateral inflammatory processes who was not prescribed surgical treatment for a range of reasons, absence of gross structural changes, lung resection, mainly in patients with oncologic lung injury, at massive and life-threatening profuse bleedings as a mean of temporary or constant hemostasis. Discussed treatment method is applied only in bleeding or within a 6 – 12 hour after its treatment. Successful result in embolization can be obtained in 79–99 %. Results. As a result of complete physical examination of patients with LB, it has been established that lung hemorrhage was the result of obstructive bronchitis in 14 patients (42 %), there was chronic obstructive pulmonary disease in 7 (21 %) patients and bronchiectasis was diagnosed in 6 (18 %) patients. In 2 (6 %) patients pulmonary hemorrhage was caused by community-acquired pneumonia. Central lung cancer was detected in 4 (12 %) patients. Conclusion. Therefore bronchial artery angiography gives high efficiency in solving the problem of hemostasis in oncological and nonspecific lung diseases, for determination of localization and source of bleeding. Endovascular occlusion of bronchial arteries in pulmonary hemorrhage permits: – to elaborate diagnosis because of the presence of specific angiographic signs of malignant tumour; – to perform effective endovascular hemostasis; – to gain time for stabilization the patient with the aim of planned surgical treatment.

scholarly journals Levofloxacin: the role and significance in the treatment of lower respiratory tract infections

2017 ◽  
Vol 94 (11) ◽  
pp. 851-860
Author(s):  
Aleksandr I. Sinopal’nikov
Keyword(s):  
Chronic Obstructive Pulmonary Disease ◽  
Pulmonary Disease ◽  
Nosocomial Pneumonia ◽  
Community Acquired Pneumonia ◽  
Chronic Obstructive ◽  
Minimal Risk ◽  
High Concentration ◽  
Obstructive Pulmonary Disease ◽  
Atypical Pathogens ◽  
Tract Infections

The advent of the first «respiratory» fluoroquinolone in the late 1990s gave rise to a dramatic growth in popularity ofantibiotics of this class. Levofloxacin like other fluoroquinolones is highly active with respect to Gram-positive, Gram-negative, and atypical pathogens including penicillin-resistant strains of Streptococcus pneumoniae. It is recommended for the treatment of community-acquired pneumonia, nosocomial pneumonia, and exacerbations of chronic obstructive pulmonary disease. Levofloxacin is safe and characterized by high bioavailability and high concentration at the site of inflammation. Therapy with its high doses (750 and 1000 mg/day) during 5 days improves the outcome of the treatment due to improved compliance and minimal risk of development of drug resistance. nosocomial pneumonia, exacerbations of chronic obstructive pulmonary disease.

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