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https://www.readbyqxmd.com/read/28633889/serious-pneumococcal-disease-outbreak-in-men-exposed-to-metal-fume-detection-response-and-future-prevention-through-pneumococcal-vaccination
#1
Judith Ewing, Lynsey Patterson, Neil Irvine, Lorraine Doherty, Anne Loughrey, Joe Kidney, Carmen Sheppard, Georgia Kapatai, Norman K Fry, Mary Ramsay, Lucy Jessop
Welders and those exposed to metal fume are known to be at increased risk of pneumococcal pneumonia and invasive pneumococcal disease. Current UK guidance recommends that vaccination against pneumococcus be considered in those at risk of frequent or continuous occupational exposure to metal fume, taking into account the exposure control measures in place. We report an outbreak of serious pneumococcal disease that occurred between April and June 2015 among a multinational workforce exposed to metal fumes while working on the refurbishment of an oil rig in a Belfast shipyard...
June 17, 2017: Vaccine
https://www.readbyqxmd.com/read/28612153/streptococcus-pneumoniae-antimicrobial-resistance-decreased-in-the-helsinki-metropolitan-area-after-routine-10-valent-pneumococcal-conjugate-vaccination-of-infants-in-finland
#2
R Sihvonen, L Siira, M Toropainen, P Kuusela, A Pätäri-Sampo
Since the introduction of 10-valent pneumococcal conjugate vaccine (PCV10) into the Finnish national vaccination program in September 2010, the incidence of invasive pneumococcal disease in children has decreased steeply in Finland. We studied the antimicrobial susceptibility of invasive and non-invasive Streptococcus pneumoniae (pneumococcus) isolated in the Helsinki Metropolitan Area during 2009-2014. We divided the data into two age groups: isolates from patients <5 years old and ≥5 years old. We also studied the serotype distribution of invasive isolates and of a subset of non-invasive multidrug-resistant isolates...
June 13, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28607461/geographic-variation-in-pneumococcal-vaccine-efficacy-estimated-from-dynamic-modeling-of-epidemiological-data-post-pcv7
#3
Erida Gjini
Although mean efficacy of multivalent pneumococcus vaccines has been intensively studied, variance in vaccine efficacy (VE) has been overlooked. Different net individual protection across settings can be driven by environmental conditions, local serotype and clonal composition, as well as by socio-demographic and genetic host factors. Understanding efficacy variation has implications for population-level effectiveness and other eco-evolutionary feedbacks. Here I show that realized VE can vary across epidemiological settings, by applying a multi-site-one-model approach to data post-vaccination...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28596991/long-persistence-of-a-streptococcus-pneumoniae-23f-clone-in-a-cystic-fibrosis-patient
#4
Martin Rieger, Harald Mauch, Regine Hakenbeck
Streptococcus pneumoniae isolates of serotype 23F with intermediate penicillin resistance were recovered on seven occasions over a period of 37 months from a cystic fibrosis patient in Berlin. All isolates expressed the same multilocus sequence type (ST), ST10523. The genome sequences of the first and last isolates, D122 and D141, revealed the absence of two phage-related gene clusters compared to the genome of another ST10523 strain, D219, isolated earlier at a different place in Germany. Genomes of all three strains carried the same novel mosaic penicillin-binding protein (PBP) genes, pbp2x, pbp2b, and pbp1a; these genes were distinct from those of other penicillin-resistant S...
May 2017: MSphere
https://www.readbyqxmd.com/read/28596944/cody-regulates-thiol-peroxidase-expression-as-part-of-the-pneumococcal-defense-mechanism-against-h2o2-stress
#5
Barak Hajaj, Hasan Yesilkaya, Sulman Shafeeq, Xiangyun Zhi, Rachel Benisty, Shiran Tchalah, Oscar P Kuipers, Nurith Porat
Streptococcus pneumoniae is a facultative anaerobic pathogen. Although it maintains fermentative metabolism, during aerobic growth pneumococci produce high levels of H2O2, which can have adverse effects on cell viability and DNA, and influence pneumococcal interaction with its host. The pneumococcus is unusual in its dealing with toxic reactive oxygen species (ROS) in that it neither has catalase nor the global regulators of peroxide stress resistance. Previously, we identified pneumococcal thiol peroxidase (TpxD) as the key enzyme for enzymatic removal of H2O2, and showed that TpxD synthesis is up-regulated upon exposure to H2O2...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28596792/a-case-series-evaluating-the-serological-response-of-adult-asthma-patients-to-the-23-valent-pneumococcal-polysaccharide-vaccine
#6
C R Laratta, K Williams, D Vethanayagam, M Ulanova, H Vliagoftis
BACKGROUND: Asthma is an independent risk factor for invasive pneumococcal disease; however, the immune response of adult asthma patients to pneumococcal vaccination is unknown. We explore the serologic response of patients with moderate to severe asthma to the 23-valent pneumococcal polysaccharide vaccine (PPSV23). METHODS: Seventeen moderate to severe adult asthma patients that had not been vaccinated against pneumococcus over the 5 previous years were prospectively recruited from a tertiary care asthma clinic...
2017: Allergy, Asthma, and Clinical Immunology
https://www.readbyqxmd.com/read/28580433/limited-impact-of-neonatal-or-early-infant-schedules-of-7-valent-pneumococcal-conjugate-vaccination-on-nasopharyngeal-carriage-of-streptococcus-pneumoniae-in-papua-new-guinean-children-a-randomized-controlled-trial
#7
Celestine Aho, Audrey Michael, Mition Yoannes, Andrew Greenhill, Peter Jacoby, John Reeder, William Pomat, Gerard Saleu, Pioto Namuigi, Suparat Phuanukoonnon, Heidi Smith-Vaughan, Amanda J Leach, Peter Richmond, Deborah Lehmann
Streptococcus pneumoniae is a leading cause of pneumonia, the most common cause of childhood death. Papua New Guinean children experience high rates of nasopharyngeal pneumococcal colonization within weeks of birth, predisposing them to pneumococcal disease. In a trial to determine the safety and immunogenicity of early infant vaccination with 7-valent pneumococcal conjugate vaccine (7vPCV), we investigated the impact of early schedules on pneumococcal carriage. Infants were randomized at birth to receive 7vPCV in a 0-1-2-month (n = 101) or a 1-2-3-month (n = 105) schedule or no 7vPCV (n = 106)...
December 2016: Vaccine Rep
https://www.readbyqxmd.com/read/28579170/vaccination-coverage-in-a-cohort-of-hiv-infected-patients-receiving-care-at-an-aids-outpatient-clinic-in-esp%C3%A3-rito-santo-brazil
#8
Lauro Ferreira da Silva Pinto Neto, Julia Vescovi Vieira, Nathália Rossoni Ronchi
This cross-sectional study assessed the immunization status of human immune deficiency virus (HIV)-infected patients receiving care at an outpatient clinic in Brazil. The sociodemographic characteristics, CD4 count and HIV viral load of 281 out of 612 adult outpatients were analyzed. A total of 331 patients were excluded because of no availability of vaccination cards. Chi-square or Fisher's exact test were used. Immunization coverage was higher for diphtheria/tetanus (59.79%) and hepatitis B (56.7%), and lowest for hepatitis A (6...
June 1, 2017: Brazilian Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28577533/an-agent-based-model-simulation-of-influenza-interactions-at-the-host-level-insight-into-the-influenza-related-burden-of-pneumococcal-infections
#9
Hélène Arduin, Matthieu Domenech de Cellès, Didier Guillemot, Laurence Watier, Lulla Opatowski
BACKGROUND: Host-level influenza virus-respiratory pathogen interactions are often reported. Although the exact biological mechanisms involved remain unelucidated, secondary bacterial infections are known to account for a large part of the influenza-associated burden, during seasonal and pandemic outbreaks. Those interactions probably impact the microorganisms' transmission dynamics and the influenza public health toll. Mathematical models have been widely used to examine influenza epidemics and the public health impact of control measures...
June 2, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28575374/evaluation-of-pneumococcal-load-in-blood-by-polymerase-chain-reaction-for-the-diagnosis-of-pneumococcal-pneumonia-in-young-children-in-the-perch-study
#10
Maria Deloria Knoll, Susan C Morpeth, J Anthony G Scott, Nora L Watson, Daniel E Park, Henry C Baggett, W Abdullah Brooks, Daniel R Feikin, Laura L Hammitt, Stephen R C Howie, Karen L Kotloff, Orin S Levine, Katherine L O'Brien, Donald M Thea, Dilruba Ahmed, Martin Antonio, Juliet O Awori, Vicky L Baillie, James Chipeta, Andrea N Deluca, Michel Dione, Amanda J Driscoll, Melissa M Higdon, Anchalee Jatapai, Ruth A Karron, Razib Mazumder, David P Moore, James Mwansa, Sammy Nyongesa, Christine Prosperi, Phil Seidenberg, Duangkamon Siludjai, Samba O Sow, Boubou Tamboura, Scott L Zeger, David R Murdoch, Shabir A Madhi
Background.: Detection of pneumococcus by lytA polymerase chain reaction (PCR) in blood had poor diagnostic accuracy for diagnosing pneumococcal pneumonia in children in 9 African and Asian sites. We assessed the value of blood lytA quantification in diagnosing pneumococcal pneumonia. Methods.: The Pneumonia Etiology Research for Child Health (PERCH) case-control study tested whole blood by PCR for pneumococcus in children aged 1-59 months hospitalized with signs of pneumonia and in age-frequency matched community controls...
June 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28575371/detection-of-pneumococcal-dna-in-blood-by-polymerase-chain-reaction-for-diagnosing-pneumococcal-pneumonia-in-young-children-from-low-and-middle-income-countries
#11
Susan C Morpeth, Maria Deloria Knoll, J Anthony G Scott, Daniel E Park, Nora L Watson, Henry C Baggett, W Abdullah Brooks, Daniel R Feikin, Laura L Hammitt, Stephen R C Howie, Karen L Kotloff, Orin S Levine, Shabir A Madhi, Katherine L O'Brien, Donald M Thea, Peter V Adrian, Dilruba Ahmed, Martin Antonio, Charatdao Bunthi, Andrea N DeLuca, Amanda J Driscoll, Louis Peter Githua, Melissa M Higdon, Geoff Kahn, Angela Karani, Ruth A Karron, Geoffrey Kwenda, Sirirat Makprasert, Razib Mazumder, David P Moore, James Mwansa, Sammy Nyongesa, Christine Prosperi, Samba O Sow, Boubou Tamboura, Toni Whistler, Scott L Zeger, David R Murdoch
Background.: We investigated the performance of polymerase chain reaction (PCR) on blood in the diagnosis of pneumococcal pneumonia among children from 7 low- and middle-income countries. Methods.: We tested blood by PCR for the pneumococcal autolysin gene in children aged 1-59 months in the Pneumonia Etiology Research for Child Health (PERCH) study. Children had World Health Organization-defined severe or very severe pneumonia or were age-frequency-matched community controls...
June 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28575365/density-of-upper-respiratory-colonization-with-streptococcus-pneumoniae-and-its-role-in-the-diagnosis-of-pneumococcal-pneumonia-among-children-aged-5-years-in-the-perch-study
#12
Henry C Baggett, Nora L Watson, Maria Deloria Knoll, W Abdullah Brooks, Daniel R Feikin, Laura L Hammitt, Stephen R C Howie, Karen L Kotloff, Orin S Levine, Shabir A Madhi, David R Murdoch, J Anthony G Scott, Donald M Thea, Martin Antonio, Juliet O Awori, Vicky L Baillie, Andrea N DeLuca, Amanda J Driscoll, Julie Duncan, Bernard E Ebruke, Doli Goswami, Melissa M Higdon, Ruth A Karron, David P Moore, Susan C Morpeth, Justin M Mulindwa, Daniel E Park, Wantana Paveenkittiporn, Barameht Piralam, Christine Prosperi, Samba O Sow, Milagritos D Tapia, Khalequ Zaman, Scott L Zeger, Katherine L O'Brien
Background.: Previous studies suggested an association between upper airway pneumococcal colonization density and pneumococcal pneumonia, but data in children are limited. Using data from the Pneumonia Etiology Research for Child Health (PERCH) study, we assessed this potential association. Methods.: PERCH is a case-control study in 7 countries: Bangladesh, The Gambia, Kenya, Mali, South Africa, Thailand, and Zambia. Cases were children aged 1-59 months hospitalized with World Health Organization-defined severe or very severe pneumonia...
June 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28566646/morin-moderates-the-biotoxicity-of-pneumococcal-pneumolysin-by-weakening-the-oligomers-formation
#13
Xiaoran Zhao, Yonglin Zhou, Guizhen Wang, Dongxue Shi, Yonghong Zha, Pengfei Yi, Jianfeng Wang
Streptococcus pneumoniae (pneumococcus) is an important causative agent of acute invasive and non-invasive infections. Pneumolysin is one of a considerable number of virulence traits produced by pneumococcus that exhibits a variety of biological activities, thus making it a target of small molecule drug development. In this study, we aimed to evaluate the effect of morin, a natural compound that has no antimicrobial activity against S. pneumonia, is a potent neutralizer of pneumolysin-mediated cytotoxicity and genotoxicity by impairing oligomer formation, and possesses the capability of mitigating tissue damage caused by pneumococcus...
2017: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28557053/a-novel-streptococcal-cell-cell-communication-peptide-promotes-pneumococcal-virulence-and-biofilm-formation
#14
Rolando A Cuevas, Rory Eutsey, Anagha Kadam, Jacob A West-Roberts, Carol A Woolford, Aaron P Mitchell, Kevin M Mason, N Luisa Hiller
Streptococcus pneumoniae (pneumococcus) is a major human pathogen. It is a common colonizer of the human respiratory track, where it utilizes cell-cell communication systems to coordinate population-level behaviors. We reasoned that secreted peptides that are highly expressed during infection are pivotal for virulence. Thus, we used in silico pattern searches to define a pneumococcal secretome, and analyzed the transcriptome of the clinically important PMEN1 lineage to identify which peptide-encoding genes are highly expressed in vivo...
May 29, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28550292/proteomic-comparisons-of-opaque-and-transparent-variants-of-streptococcus-pneumoniae-by-two-dimensional-differential-gel-electrophoresis
#15
Melissa H Chai, Florian Weiland, Richard M Harvey, Peter Hoffmann, Abiodun D Ogunniyi, James C Paton
Streptococcus pneumoniae (the pneumococcus) is a human pathogen, accounting for massive global morbidity and mortality. Although asymptomatic colonization of the nasopharynx almost invariably precedes disease, the critical determinants enabling pneumococcal progression from this niche to cause invasive disease are poorly understood. One mechanism proposed to be central to this transition involves opacity phase variation, whereby pneumococci harvested from the nasopharynx are typically transparent, while those simultaneously harvested from the blood are opaque...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28542565/promiscuous-signaling-by-a-regulatory-system-unique-to-the-pandemic-pmen1-pneumococcal-lineage
#16
Anagha Kadam, Rory A Eutsey, Jason Rosch, Xinyu Miao, Mark Longwell, Wenjie Xu, Carol A Woolford, Todd Hillman, Anfal Shakir Motib, Hasan Yesilkaya, Aaron P Mitchell, N Luisa Hiller
Streptococcus pneumoniae (pneumococcus) is a leading cause of death and disease in children and elderly. Genetic variability among isolates from this species is high. These differences, often the product of gene loss or gene acquisition via horizontal gene transfer, can endow strains with new molecular pathways, diverse phenotypes, and ecological advantages. PMEN1 is a widespread and multidrug-resistant pneumococcal lineage. Using comparative genomics we have determined that a regulator-peptide signal transduction system, TprA2/PhrA2, was acquired by a PMEN1 ancestor and is encoded by the vast majority of strains in this lineage...
May 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28518018/penicillin-resistance-of-nonvaccine-type-pneumococcus-before-and-after-pcv13-introduction-united-states
#17
Cheryl P Andam, Colin J Worby, Ryan Gierke, Lesley McGee, Tamara Pilishvili, William P Hanage
Introduction of 13-valent pneumococcal conjugate vaccine in the United States was not associated with a significant change in prevalence of penicillin resistance in nonvaccine type serotypes because of the variable success of highly resistant serotypes. Differences in regional serotype distribution and serotype-specific resistance contributed to geographic heterogeneity of penicillin resistance.
June 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28513594/regionally-compartmentalized-resident-memory-t-cells-mediate-naturally-acquired-protection-against-pneumococcal-pneumonia
#18
N Ms Smith, G A Wasserman, F T Coleman, K L Hilliard, K Yamamoto, E Lipsitz, R Malley, H Dooms, M R Jones, L J Quinton, J P Mizgerd
As children age, they become less susceptible to the diverse microbes causing pneumonia. These microbes are pathobionts that infect the respiratory tract multiple times during childhood, generating immunological memory. To elucidate mechanisms of such naturally acquired immune protection against pneumonia, we modeled a relevant immunological history in mice by infecting their airways with mismatched serotypes of Streptococcus pneumoniae (pneumococcus). Previous pneumococcal infections provided protection against a heterotypic, highly virulent pneumococcus, as evidenced by reduced bacterial burdens and long-term sterilizing immunity...
May 17, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28453405/a-meta-analysis-of-antimicrobial-susceptibility-profiles-for-pneumococcal-pneumonia-in-sub-saharan-africa
#19
Pui-Ying Iroh Tam, Ayebo E Sadoh, Stephen K Obaro
BACKGROUND: Pneumonia causes an enormous burden of childhood disease globally, particularly in low- and middle-income countries. Pneumococcus is the most common bacterial aetiology of pneumonia; however, antimicrobials are limited and may not adequately address the local epidemiology of the region. AIM: To undertake a review and meta-analysis of pneumonia studies in sub-Saharan Africa to evaluate antimicrobial susceptibility patterns in childhood pneumonia. METHODS: Articles published in PubMed and Google between 2006 and 2016 which evaluated antimicrobial susceptibility profiles of pneumococcal pneumonia in children in sub-Saharan Africa were identified...
April 28, 2017: Paediatrics and International Child Health
https://www.readbyqxmd.com/read/28451868/juglone-alleviates-pneumolysin-induced-human-alveolar-epithelial-cell-injury-via-inhibiting-the-hemolytic-activity-of-pneumolysin
#20
Meng Song, Gejin Lu, Meng Li, Xuming Deng, Jianfeng Wang
Streptococcus pneumoniae (the pneumococcus) is an opportunistic pathogen responsible for several human diseases, including acute otitis media, pneumonia, sepsis and bacterial meningitis, and possesses numerous virulence factors associated with pneumococcal infection and pathogenesis. With the capacity to form pores in cholesterol-rich membranes, pneumolysin (PLY) is a key virulence factor of S. pneumoniae and causes severe tissue damage during pneumococcal infection. Juglone (JG), a natural 1,4-naphthoquinone widely found in the roots, leaves, woods and fruits of Juglandaceae walnut trees, inhibits PLY-induced hemolysis via inhibition of the oligomerization of PLY and exhibits minimal anti-S...
April 27, 2017: Antonie Van Leeuwenhoek
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