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Chlamydia pneumoniae

Mika A Brown, Michael G Potroz, Seoh-Wei Teh, Nam-Joon Cho
Due to the global prevalence of Chlamydiae, exploring studies of diverse antichlamydial compounds is important in the development of effective treatment strategies and global infectious disease management. Chlamydiaceae is the most widely known bacterial family of the Chlamydiae order. Among the species in the family Chlamydiaceae, Chlamydia trachomatis and Chlamydia pneumoniae cause common human diseases, while Chlamydia abortus, Chlamydia psittaci, and Chlamydia suis represent zoonotic threats or are endemic in human food sources...
October 16, 2016: Microorganisms
Prawin Kumar, Guruprasad R Medigeshi, Vishnu S Mishra, Mojahidul Islam, Shivani Randev, Aparna Mukherjee, Rama Chaudhry, Arti Kapil, Kana Ram Jat, Rakesh Lodha, Sushil K Kabra
BACKGROUND: There is paucity of studies on etiology of acute respiratory infections (ARI) in infants. OBJECTIVE: To document incidence and etiology of ARI in infants, their seasonal variability and association of clinical profile with etiology. MATERIAL AND METHODS: A birth cohort was followed for the first year of life; for each episode of ARI, nasopharyngeal aspirates were collected to identify the causative respiratory virus/es using multiplex real time PCR assay...
October 6, 2016: Pediatric Infectious Disease Journal
Susanne Paukner, Rosemarie Riedl
Pleuromutilins are antibiotics that selectively inhibit bacterial translation and are semisynthetic derivatives of the naturally occurring tricyclic diterpenoid pleuromutilin, which received its name from the pleuromutilin-producing fungus Pleurotus mutilus Tiamulin and valnemulin are two established derivatives in veterinary medicine for oral and intramuscular administration. As these early pleuromutilin drugs were developed at a time when companies focused on major antibacterial classes, such as the β-lactams, and resistance was not regarded as an issue, interest in antibiotic research including pleuromutilins was limited...
October 14, 2016: Cold Spring Harbor Perspectives in Medicine
Frederick Palm, Pirkko J Pussinen, Annette Aigner, Heiko Becher, Florian Buggle, Matthias F Bauer, Caspar Grond-Ginsbach, Anton Safer, Christian Urbanek, Armin J Grau
BACKGROUND AND AIMS: Infectious diseases contribute to stroke risk, and are associated with socioeconomic status (SES). We tested the hypotheses that the aggregate burden of infections increases the risk of ischemic stroke (IS) and partly explains the association between low SES and ischemic stroke. METHODS: In a case-control study with 470 ischemic stroke patients and 809 age- and sex-matched controls, randomly selected from the population, antibodies against the periodontal microbial agents Aggregatibacter actinomycetemcomitans and Porphyromonas gingivalis, against Chlamydia pneumonia, Mycoplasma pneumoniae (IgA and IgG), and CagA-positive Helicobacter pylori (IgG) were assessed...
October 5, 2016: Atherosclerosis
N S Kochar, S Garg, A Oberoi, S Chopra
No abstract text is available yet for this article.
January 2016: Journal of the Association of Physicians of India
Ji-Young Joo, Gil Sun Cha, Jin Chung, Ju-Youn Lee, Sung-Jo Kim, Jeomil Choi
BACKGROUND: Although periodontal pathogens show a strong association with the development of atherosclerosis, little is known about how a microorganism contributes to disease onset and progression. Oxidation of low-density lipoprotein (LDL) is a major risk factor of atherogenesis. The principal objective of our study was to evaluate the ability of peptide 19 (Pep19) of Porphyromonas gingivalis (P. gingivalis) heat shock protein (HSP) as a potent inducer of LDL oxidation, and as a secondary objective, to compare this ability with that of Pep19 from different bacteria...
October 7, 2016: Journal of Periodontology
Henning Zeidler, Alan P Hudson
Reactive (inflammatory) arthritis has been known for many years to follow genital infection with the intracellular bacterial pathogen Chlamydia trachomatis in some individuals. Recent studies from several groups have demonstrated that a related bacterium, the respiratory pathogen Chlamydia pneumoniae, can elicit a similar arthritis. Studies of these organisms, and of a set of gastrointestinal pathogens also associated with engendering inflammatory arthritis, have been relatively extensive. However, reports focusing on coinfections with these and/or other organisms, and the effects of such coinfections on the host immune and other systems, have been rare...
August 24, 2016: Microorganisms
Sarah Van Lent, Winnok H De Vos, Heather Huot Creasy, Patricia X Marques, Jacques Ravel, Daisy Vanrompay, Patrik Bavoil, Ru-Ching Hsia
The polymorphic membrane protein (Pmp) paralogous families of Chlamydia trachomatis, Chlamydia pneumoniae and Chlamydia abortus are putative targets for Chlamydia vaccine development. To determine whether this is also the case for Pmp family members of C. psittaci, we analyzed transcription levels, protein production and localization of several Pmps of C. psittaci. Pmp expression profiles were characterized using quantitative real-time PCR (RT-qPCR), immunofluorescence (IF) and immuno-electron microscopy (IEM) under normal and stress conditions...
2016: PloS One
John D Carter, Alan P Hudson
INTRODUCTION: Reactive arthritis (ReA) is an inflammatory disease that can follow gastrointestinal or genitourinary infections. The primary etiologic agent for post-venereal ReA is the bacterium Chlamydia trachomatis; its relative, C pneumoniae, has also been implicated in disease induction although to a lesser degree. Studies have indicated that the arthritis is elicited by chlamydiae infecting synovial tissue in an unusual biologic state designated persistence. We review clinical aspects, host-pathogen interactions, and treatments for the disease...
September 14, 2016: Expert Review of Clinical Immunology
Ivan V Litvinov, Anna Shtreis, Kenneth Kobayashi, Steven Glassman, Matthew Tsang, Anders Woetmann, Denis Sasseville, Niels Ødum, Madeleine Duvic
Most skin malignancies are caused by external and often preventable environmental agents. Multiple reports demonstrated that cutaneous T-cell lymphomas (CTCL) can occur in married couples and cluster in families. Furthermore, recent studies document geographic clustering of this malignancy in Texas as well as in other areas of the United States. Multiple infectious, occupational, and medication causes have been proposed as triggers or promoters of this malignancy including hydrochlorothiazide diuretics, Staphylococcus aureus, dermatophytes, Mycobacterium leprae, Chlamydia pneumoniae, human T-Cell lymphotropic virus type 1 (HTLV1), Epstein-Barr virus (EBV), and herpes simplex virus (HSV)...
July 2016: Oncoimmunology
Anne-Marie Ionescu, Divya Khare, Jay Kavi
A 61-year-old man was admitted with a 1-week history of influenza-like symptoms during a period of increased influenza virus activity. He soon developed type 2 respiratory failure and became increasingly drowsy. He later suffered a convulsive episode in the intensive care unit (ICU) which self-terminated. Initial clinical findings suggested community-acquired pneumonia and meningoencephalitis. However, a detailed history revealed that he was a pet bird-keeper, which raised a suspicion of ornithosis. Chlamydia psittaci DNA was detected in sputum by PCR...
2016: BMJ Case Reports
Izumi Yanatori, Yumiko Yasui, Kazunobu Ouchi, Fumio Kishi
Chlamydia pneumoniae is a Gram-negative, obligate intracellular pathogen that causes community-acquired respiratory infections. After C. pneumoniae invades host cells, it disturbs the vesicle transport system to escape host lysosomal or autophagosomal degradation. By using a yeast mis-sorting assay, we found 10 C. pneumoniae candidate genes involved in aberrant vesicular trafficking in host cells. One of the candidate genes, CPj0783, was recognized by antibodies from C. pneumoniae-infected patients. The expression of CPj0783 was detected at mid to late-cycle time points and increased during the inclusion maturation...
December 2015: International Microbiology: the Official Journal of the Spanish Society for Microbiology
Jing Li, Weina Guo, Bernhard Kaltenboeck, Konrad Sachse, Yi Yang, Guangwu Lu, Jilei Zhang, Lu Luan, Jinfeng You, Ke Huang, Haixiang Qiu, Yaoyao Wang, Min Li, Zhangping Yang, Chengming Wang
To investigate the prevalence and diversity of bovine Chlamydia spp. in cattle, whole blood from dairy and beef cattle in 11 provinces of China (n=2003) and vaginal swabs, whole blood samples, feces, milk samples from cows in a Yangzhou dairy farm (n=108) were examined using genus- and species-specific PCRs. In cattle from 11 provinces, 2.4% (48/2003) of whole-blood samples were positive for Chlamydia spp., and four Chlamydia species (C. pneumoniae, 41.7%, 20/48; C. psittaci, 22.9%, 11/48; C. gallinacea, 20...
September 25, 2016: Veterinary Microbiology
Shankar J Evani, Shatha F Dallo, Anand K Ramasubramanian
Multiple studies support the hypothesis that infectious agents may be involved in the pathogenesis of atherosclerosis. Chlamydia pneumoniae is strongly implicated in atherosclerosis, but the precise role has been underestimated and poorly understood due to the complexity of the disease process. In this work, we test the hypothesis that C. pneumoniae-infected macrophages lodged in the subendothelial matrix contribute to atherogenesis through pro-inflammatory factors and by cell-matrix interactions. To test this hypothesis, we used a 3D infection model with freshly isolated PBMC infected with live C...
2016: Frontiers in Microbiology
Priya Maheshwari, Guy D Eslick
BACKGROUND: The possibility of an infectious etiology for Alzheimer's disease (AD) has been repeatedly postulated over the past three decades, with the roles of both viruses and bacteria having been investigated. Chlamydophila (formerly Chlamydia) pneumoniae (Cpn) and spirochetal bacteria have been two of the most frequently implicated bacterial groups in AD pathogenesis. OBJECTIVE: A meta-analysis was performed where data was combined from 25 studies examining the association between AD and spirochetal bacteria or Cpn...
August 18, 2016: Journal of Alzheimer's Disease: JAD
J T Mackie, A K Gillett, C Palmieri, T Feng, D P Higgins
Chlamydiosis is a common infectious disease of koalas (Phascolarctos cinereus), but Chlamydia spp. have not yet been demonstrated to cause pneumonia in these animals. A juvenile male koala died following an episode of respiratory disease. At necropsy examination, the lung tissue was consolidated. Microscopical lesions in the lung included pyogranulomatous bronchopneumonia, proliferation of bronchiolar and alveolar epithelium and interstitial fibrosis. Hyperplastic bronchiolar epithelial cells contained aggregates of small basophilic punctate organisms, which were confirmed as chlamydiae by transmission electron microscopy and immunohistochemistry...
August 24, 2016: Journal of Comparative Pathology
Sören E T Luczak, Sander H J Smits, Christina Decker, Luitgard Nagel-Steger, Lutz Schmitt, Johannes H Hegemann
Chlamydiae sp. are obligate intracellular pathogens that cause a variety of diseases in humans. Adhesion of Chlamydiae to the eukaryotic host cell is a pivotal step in pathogenesis. The adhesin family of polymorphic membrane proteins (Pmp) in Chlamydia pneumoniae consists of 21 members. Pmp21 binds to the epidermal growth factor receptor (EGFR). Pmps contain large numbers of FxxN and GGA(I, L, V) motifs. At least two of these motifs are crucial for adhesion by certain Pmp21 fragments. Here we describe how the two FxxN motifs in Pmp21-D (D-Wt), a domain of Pmp21, influence its self-interaction, folding and adhesive capacities...
August 22, 2016: Journal of Biological Chemistry
Stephen Villano, Judith Steenbergen, Evan Loh
Omadacycline is a first-in-class aminomethylcycline antibiotic that circumvents common tetracycline resistance mechanisms. In vitro omadacycline has potent activity against Gram-positive aerobic bacteria including methicillin-resistant Staphylococcus aureus, penicillin-resistant and multidrug-resistant Streptococcus pneumoniae, and vancomycin-resistant Enterococcus spp. It is also active against common Gram-negative aerobes, some anaerobes and atypical bacteria including Legionella spp. and Chlamydia spp. Ongoing Phase III clinical trials with omadacycline are investigating once daily doses of 100 mg intravenously followed by once daily doses of 300 mg orally for the treatment of acute bacterial skin and skin structure infections and community-acquired bacterial pneumonia...
August 19, 2016: Future Microbiology
Amba Lawrence, Tamieka Fraser, Amber Gillett, Joel D A Tyndall, Peter Timms, Adam Polkinghorne, Wilhelmina M Huston
The koala, an iconic marsupial native to Australia, is a threatened species in many parts of the country. One major factor in the decline is disease caused by infection with Chlamydia. Current therapeutic strategies to treat chlamydiosis in the koala are limited. This study examines the effectiveness of an inhibitor, JO146, which targets the HtrA serine protease for treatment of C. pecorum and C. pneumoniae in vitro and ex vivo with the aim of developing a novel therapeutic for koala Chlamydia infections. Clinical isolates from koalas were examined for their susceptibility to JO146...
2016: Scientific Reports
(no author information available yet)
Repeated or prolonged exposure to Chlamydia pneumoniae may have a causal association with wheezing, asthmatic bronchitis and asthma.
August 7, 1991: Nursing Standard
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