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Browsing by Author "Erlendsdóttir, Helga"

Browsing by Author "Erlendsdóttir, Helga"

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    Acetylsalicylic acid use is associated with improved survival in bacteremic pneumococcal pneumonia : A long-term nationwide study 
    Rögnvaldsson, Kristján Godsk; Bjarnason, Agnar; Kristinsson, Karl Gústaf; Bragason, Hörður T; Erlendsdóttir, Helga; Þorgeirsson, Guðmundur; Gottfreðsson, Magnús (2022-08)
    BACKGROUND: Pneumonia is commonly caused by Streptococcus pneumoniae (pneumococcus) and associated with subsequent cardiovascular complications and increased mortality. Potential short-term survival benefits conferred by acetylsalicylic acid (ASA) use ...
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    Changes in the incidence of invasive disease due to Streptococcus pneumoniae, Haemophilus influenzae, and Neisseria meningitidis during the COVID-19 pandemic in 26 countries and territories in the Invasive Respiratory Infection Surveillance Initiative : a prospective analysis of surveillance data 
    Brueggemann, Angela B.; Jansen van Rensburg, Melissa J.; Shaw, David; McCarthy, Noel D.; Jolley, Keith A.; Maiden, Martin C.J.; van der Linden, Mark P.G.; Amin-Chowdhury, Zahin; Bennett, Désirée E.; Borrow, Ray; Brandileone, Maria Cristina C.; Broughton, Karen; Campbell, Ruth; Cao, Bin; Casanova, Carlo; Choi, Eun Hwa; Chu, Yiu Wai; Clark, Stephen A.; Claus, Heike; Coelho, Juliana; Corcoran, Mary; Cottrell, Simon; Cunney, Robert J.; Dalby, Tine; Davies, Heather; de Gouveia, Linda; Deghmane, Ala Eddine; Demczuk, Walter; Desmet, Stefanie; Drew, Richard J.; du Plessis, Mignon; Erlendsdóttir, Helga; Fry, Norman K.; Fuursted, Kurt; Gray, Steve J.; Henriques-Normark, Birgitta; Hale, Thomas; Hilty, Markus; Hoffmann, Steen; Humphreys, Hilary; Ip, Margaret; Jacobsson, Susanne; Johnston, Jillian; Kozakova, Jana; Kristinsson, Karl Gústaf; Krizova, Pavla; Kuch, Alicja; Ladhani, Shamez N.; Lâm, Thiên Trí; Lebedova, Vera; Lindholm, Laura; Litt, David J.; Martin, Irene; Martiny, Delphine; Mattheus, Wesley; McElligott, Martha; Meehan, Mary; Meiring, Susan; Mölling, Paula; Morfeldt, Eva; Morgan, Julie; Mulhall, Robert M.; Muñoz-Almagro, Carmen; Murdoch, David R.; Murphy, Joy; Musilek, Martin; Mzabi, Alexandre; Perez-Argüello, Amaresh; Perrin, Monique; Perry, Malorie; Redin, Alba; Roberts, Richard; Roberts, Maria; Rokney, Assaf; Ron, Merav; Scott, Kevin J.; Sheppard, Carmen L.; Siira, Lotta; Skoczyńska, Anna; Sloan, Monica; Slotved, Hans Christian; Smith, Andrew J.; Song, Joon Young; Taha, Muhamed Kheir; Toropainen, Maija; Tsang, Dominic; Vainio, Anni; van Sorge, Nina M.; Varon, Emmanuelle; Vlach, Jiri; Vogel, Ulrich; Vohrnova, Sandra; von Gottberg, Anne; Zanella, Rosemeire C.; Zhou, Fei (2021-06)
    Background: Streptococcus pneumoniae, Haemophilus influenzae, and Neisseria meningitidis, which are typically transmitted via respiratory droplets, are leading causes of invasive diseases, including bacteraemic pneumonia and meningitis, and of secondary ...
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    Comparison of Serotype Prevalence of Pneumococci Isolated from Middle Ear, Lower Respiratory Tract and Invasive Disease Prior to Vaccination in Iceland 
    Hjálmarsdóttir, Martha Ásdís; Quirk, Sigríður Júlía; Haraldsson, Gunnsteinn; Erlendsdóttir, Helga; Haraldsson, Ásgeir; Kristinsson, Karl G. (Public Library of Science (PLoS), 2017-01-26)
    Background Information on pneumococcal serotype distribution before vaccination is a prerequisite for evaluation of vaccine effect. The aim was to investigate the prevalence of pneumococcal serotypes isolated from middle ear (ME), lower respiratory ...
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    The Effect of the 10-Valent Pneumococcal Nontypeable Haemophilus influenzae Protein D Conjugate Vaccine on H. influenzae in Healthy Carriers and Middle Ear Infections in Iceland 
    Sveinsdóttir, Hildigunnur; Björnsdóttir, Jana Birta; Erlendsdóttir, Helga; Hjálmarsdóttir, Martha Ásdís; Hrafnkelsson, Birgir; Haraldsson, Ásgeir; Kristinsson, Karl G.; Haraldsson, Gunnsteinn (American Society for Microbiology, 2019-05-08)
    Vaccinations with the 10-valent pneumococcal conjugated vaccine (PHiD-CV) started in Iceland in 2011. Protein D (PD) from H. influenzae, which is coded for by the hpd gene, is used as a conjugate in the vaccine and may provide protection against ...
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    Effect of Vaccination on Pneumococci Isolated from the Nasopharynx of Healthy Children and the Middle Ear of Children with Otitis Media in Iceland 
    Quirk, Sigríður Júlía; Haraldsson, Gunnsteinn; Erlendsdóttir, Helga; Hjálmarsdóttir, Martha Ásdís; van Tonder, Andries J.; Hrafnkelsson, Birgir; Sigurdsson, Samuel; Bentley, Stephen D.; Haraldsson, Ásgeir; Brueggemann, Angela B.; Kristinsson, Karl G. (American Society for Microbiology, 2018-09-26)
    Vaccination with pneumococcal conjugate vaccines (PCVs) disrupts the pneumococcal population. Our aim was to determine the impact of the 10-valent PCV on the serotypes, genetic lineages, and antimicrobial susceptibility of pneumococci isolated from ...
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    Genomic Analyses of >3,100 Nasopharyngeal Pneumococci Revealed Significant Differences Between Pneumococci Recovered in Four Different Geographical Regions 
    van Tonder, Andries J.; Bray, James E.; Jolley, Keith A.; Jansen van Rensburg, Melissa; Quirk, Sigríður Júlía; Haraldsson, Gunnsteinn; Maiden, Martin; Bentley, Stephen D.; Haraldsson, Ásgeir; Erlendsdóttir, Helga; Kristinsson, Karl G.; Brueggemann, Angela B. (Frontiers Media SA, 2019-02-25)
    Understanding the structure of a bacterial population is essential in order to understand bacterial evolution. Estimating the core genome (those genes common to all, or nearly all, strains of a species) is a key component of such analyses. The size and ...
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    Group B streptococcal infections in infants in Iceland : Clinical and microbiological factors 
    Bæringsdóttir, Birta; Erlendsdóttir, Helga; Björnsdóttir, Erla Soffía; Martins, Elisabete R.; Ramirez, Mário; Haraldsson, Ásgeir; Þórkelsson, Þórður (2021-09-23)
    Introduction. Group B streptococcus (GBS) is a leading cause of invasive neonatal infections. These have been divided into early-onset disease (EOD; <7 days) and late-onset disease (LOD; 7–89 days), with different GBS clonal complexes (CCs) associated ...
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    Heilahimnubólga hjá börnum á Íslandi af völdum pneumókokka : Sjúkratilfelli og yfirlit 
    Stensrud, Jens; Oskarsson, Oskar Orn; Erlendsdóttir, Helga; Thors, Valtýr Stefánsson (2023-11)
    Ellefu mánaða gömul stúlka var send á bráðamóttöku Barnaspítala Hringsins vegna hita og slappleika. Stúlkan var bráðveik við skoðun með sveiflukennda meðvitund. Henni versnaði mjög hratt stuttu eftir komu og reyndist hún vera með heilahimnubólgu af ...
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    Impact of the 10-valent pneumococcal conjugate vaccine on antimicrobial prescriptions in young children: a whole population study 
    Eyþórsson, Elías; Sigurdsson, Samuel; Hrafnkelsson, Birgir; Erlendsdóttir, Helga; Haraldsson, Ásgeir; Kristinsson, Karl G. (Springer Science and Business Media LLC, 2018-10-04)
    Background: Antimicrobial resistance is a public-health threat and antimicrobial consumption is the main contributor. The ten-valent pneumococcal conjugate vaccine (PHiD-CV10) was introduced into the Icelandic vaccination program in 2011. The aim ...
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    Impact of the 10-valent pneumococcal conjugate vaccine on hospital admissions in children under three years of age in Iceland 
    Sigurdsson, Samuel; Eyþórsson, Elías; Erlendsdóttir, Helga; Hrafnkelsson, Birgir; Kristinsson, Karl G.; Haraldsson, Ásgeir (Elsevier BV, 2020-03-10)
    Introduction: Pneumococcus is an important respiratory pathogen. The 10-valent pneumococcal vaccine (PHiD-CV) was introduced into the Icelandic vaccination programme in 2011. The aim was to estimate the impact of PHiD-CV on paediatric hospitalisations ...
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    Increase in tympanostomy tube placements despite pneumococcal vaccination, a population-based study 
    Eyþórsson, Elías; Sigurdsson, Samuel; Erlendsdóttir, Helga; Hrafnkelsson, Birgir; Kristinsson, Karl G.; Haraldsson, Ásgeir (Wiley, 2019-01-22)
    Aim: The aim was to estimate the impact of the 10-valent pneumococcal vaccine (PHiD-CV) on tympanostomy tube placements (TTP) in children under five years of age in Iceland. Methods: This population-based observational cohort study followed 11 consecutive ...
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    Ífarandi sýkingar af völdum Bacillus-tegunda á Íslandi árin 2006-2018 
    Gunnarsdóttir, Anna Kristín; Erlendsdóttir, Helga; Gottfreðsson, Magnús (2022-03-03)
    INNGANGUR Bakteríur af ættkvíslinni Bacillus finnast víða í umhverfinu og eru almennt taldar hafa litla meinvirkni, að miltisbrandsbakteríunni B. anthracis undanskilinni. Oft er álitið að um mengun sé að ræða ef Bacillus-tegundir finnast með ræktun. ...
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    Nasopharyngeal competition dynamics are likely to be altered following vaccine introduction : bacteriocin prevalence and diversity among Icelandic and Kenyan pneumococci 
    Butler, Madeleine E B; Jansen van Rensburg, Melissa J; Karani, Angela; Mvera, Benedict; Akech, Donald; Akter, Asma; Forrest, Calum; van Tonder, Andries J; Quirk, Sigríður Júlía; Haraldsson, Gunnsteinn Ægir; Bentley, Stephen D; Erlendsdóttir, Helga; Haraldsson, Ásgeir; Kristinsson, Karl Gústaf; Scott, J Anthony G; Brueggemann, Angela B (2023-07)
    Bacteriocins are antimicrobial peptides produced by bacteria to inhibit other bacteria in the surrounding environment. Streptococcus pneumoniae is a leading cause of disease worldwide and colonises the healthy human nasopharynx, where it competes for ...
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    Pneumococcal vaccination: Direct and herd effect on carriage of vaccine types and antibiotic resistance in Icelandic children 
    Sigurdsson, Samuel; Erlendsdóttir, Helga; Quirk, Sigríður Júlía; Kristjánsson, Júlíus; Hauksson, Kristján; Andrésdóttir, Birta Dögg Ingudóttir; Jónsson, Arnar Jan; Halldórsson, Kolbeinn Hans; Saemundsson, Arni; Ólason, Óli Hilmar; Hrafnkelsson, Birgir; Kristinsson, Karl G.; Haraldsson, Ásgeir (Elsevier BV, 2017-09)
    Background Since the introduction of pneumococcal conjugate vaccines, vaccine type pneumococcal carriage and disease has decreased world-wide. The aim was to monitor changes in the nasopharyngeal carriage of pneumococci, the distribution of serotypes ...
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    Population Genomic Molecular Epidemiological Study of Macrolide-Resistant Streptococcus pyogenes in Iceland, 1995 to 2016: Identification of a Large Clonal Population with a pbp2x Mutation Conferring Reduced In Vitro β-Lactam Susceptibility 
    Southon, Sara B.; Beres, Stephen B.; Kachroo, Priyanka; Saavedra, Matthew Ojeda; Erlendsdóttir, Helga; Haraldsson, Gunnsteinn; Yerramilli, Prasanti; Pruitt, Layne; Zhu, Luchang; Musser, James M.; Kristinsson, Karl G. (American Society for Microbiology, 2020-06-10)
    Resistance to macrolide antibiotics is a global concern in the treatment of Streptococcus pyogenes (group A Streptococcus [GAS]) infections. In Iceland, since the detection of the first macrolide-resistant isolate in 1998, three epidemic waves of ...
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    Reduction of antimicrobial resistant pneumococci seven years after introduction of pneumococcal vaccine in Iceland 
    Hjálmarsdóttir, Martha Ásdís; Haraldsson, Gunnsteinn Ægir; Quirk, Sigríður Júlía; Haraldsson, Ásgeir; Erlendsdóttir, Helga; Kristinsson, Karl Gústaf (2020)
    Background Penicillin non-susceptible (PNSP) and multi-resistant pneumococci have been prevalent in Iceland since early nineties, mainly causing problems in treatment of acute otitis media. The 10-valent protein conjugated pneumococcal vaccine (PHiD-CV) ...
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    Stress related disorders and subsequent risk of life threatening infections: population based sibling controlled cohort study 
    Song, Huan; Fall, Katja; Fang, Fang; Erlendsdóttir, Helga; Lu, Donghao; Mataix-Cols, David; Fernández de la Cruz, Lorena; D’Onofrio, Brian M.; Lichtenstein, Paul; Gottfredsson, Magnus; Almqvist, Catarina; Valdimarsdottir, Unnur (BMJ, 2019-10-23)
    Objective: To assess whether severe psychiatric reactions to trauma and other adversities are associated with subsequent risk of life threatening infections. Design: Population and sibling matched cohort study. Setting: Swedish population. Participants: ...
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    Trends in invasive bacterial diseases during the first 2 years of the COVID-19 pandemic : analyses of prospective surveillance data from 30 countries and territories in the IRIS Consortium 
    Shaw, David; Abad, Raquel; Amin-Chowdhury, Zahin; Bautista, Adriana; Bennett, Desiree; Broughton, Karen; Cao, Bin; Casanova, Carlo; Choi, Eun Hwa; Chu, Yiu-Wai; Claus, Heike; Coelho, Juliana; Corcoran, Mary; Cottrell, Simon; Cunney, Robert; Cuypers, Lize; Dalby, Tine; Davies, Heather; de Gouveia, Linda; Deghmane, Ala-Eddine; Demczuk, Walter; Desmet, Stefanie; Domenech, Mirian; Drew, Richard; du Plessis, Mignon; Duarte, Carolina; Erlendsdóttir, Helga; Fry, Norman K; Fuursted, Kurt; Hale, Thomas; Henares, Desiree; Henriques-Normark, Birgitta; Hilty, Markus; Hoffmann, Steen; Humphreys, Hilary; Ip, Margaret; Jacobsson, Susanne; Johnson, Christopher; Johnston, Jillian; Jolley, Keith A; Kawabata, Aníbal; Kozakova, Jana; Kristinsson, Karl Gústaf; Krizova, Pavla; Kuch, Alicja; Ladhani, Shamez; Lâm, Thiên-Trí; León, María Eugenia; Lindholm, Laura; Litt, David; Maiden, Martin C J; Martin, Irene; Martiny, Delphine; Mattheus, Wesley; McCarthy, Noel D; Meehan, Mary; Meiring, Susan; Mölling, Paula; Morfeldt, Eva; Morgan, Julie; Mulhall, Robert; Muñoz-Almagro, Carmen; Murdoch, David; Murphy, Joy; Musilek, Martin; Mzabi, Alexandre; Novakova, Ludmila; Oftadeh, Shahin; Perez-Argüello, Amaresh; Pérez-Vázquez, Maria; Perrin, Monique; Perry, Malorie; Prevost, Benoit; Roberts, Maria; Rokney, Assaf; Ron, Merav; Sanabria, Olga Marina; Scott, Kevin J; Sheppard, Carmen; Siira, Lotta; Sintchenko, Vitali; Skoczyńska, Anna; Sloan, Monica; Slotved, Hans-Christian; Smith, Andrew J; Steens, Anneke; Taha, Muhamed-Kheir; Toropainen, Maija; Tzanakaki, Georgina; Vainio, Anni; van der Linden, Mark P G; van Sorge, Nina M; Varon, Emmanuelle; Vohrnova, Sandra; von Gottberg, Anne; Yuste, Jose; Zanella, Rosemeire; Zhou, Fei; Brueggemann, Angela B (2023-09)
    BACKGROUND: The Invasive Respiratory Infection Surveillance (IRIS) Consortium was established to assess the impact of the COVID-19 pandemic on invasive diseases caused by Streptococcus pneumoniae, Haemophilus influenzae, Neisseria meningitidis, and ...