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J. Ollgren · SciRah

Researcher profile · Semantic Scholar

J. Ollgren

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J. Ollgren — researcher profile on SciRah

h-index: 33
Works: 130
Citations: 3,398

Most-cited papers

Antimicrobials Increase Travelers' Risk of Colonization by Extended-Spectrum Betalactamase-Producing Enterobacteriaceae
A. Kantele, Tinja Lääveri, S. Mero, Katri Vilkman +4 more
2015Clinical Infectious Diseases301 citations Open access
Semantic Scholar
Population-based burden of bloodstream infections in Finland.
K. Skogberg, O. Lyytikäinen, J. Ollgren, J. Nuorti +1 more
2012Clinical Microbiology and Infection138 citations Open access
Semantic Scholar
Risk of invasive pneumococcal infections among working age adults with asthma
P. Klemets, O. Lyytikäinen, P. Ruutu, J. Ollgren +3 more
2010Thorax109 citations Open access
Semantic Scholar
Disease burden of Puumala virus infections, 1995–2008
P. Makary, M. Kanerva, J. Ollgren, M. Virtanen +2 more
2010Epidemiology and Infection95 citations Open access
Semantic Scholar
Population-Based Study of Bloodstream Infection Incidence and Mortality Rates, Finland, 2004–2018
Keiju S. K. Kontula, K. Skogberg, J. Ollgren, A. Järvinen +1 more
2021Emerging Infectious Diseases83 citations Open access
Semantic Scholar
Analysis of results from the Joint External Evaluation: examining its strength and assessing for trends among participating countries
Vin Gupta, J. Kraemer, Rebecca Katz, A. Jha +4 more
2018Journal of Global Health58 citations Open access
Semantic Scholar
Bacterial meningitis in Finland, 1995–2014: a population-based observational study
Aleksandra Polkowska, M. Toropainen, J. Ollgren, O. Lyytikäinen +1 more
2017BMJ Open53 citations Open access
Semantic Scholar
First year experience of rotavirus immunisation programme in Finland.
T. Leino, J. Ollgren, H. Salo, Petri Tiihonen +1 more
2012Vaccine48 citations
Semantic Scholar
Women report more symptoms and impaired quality of life: a survey of Finnish COVID-19 survivors
A. Lindahl, Miia Aro, Jere P. Reijula, M. Mäkelä +4 more
2021Infectious Diseases43 citations Open access
Semantic Scholar
Comparison of the clinical characteristics and outcomes of hospitalized adult COVID-19 and influenza patients – a prospective observational study
R. Auvinen, H. Nohynek, R. Syrjänen, J. Ollgren +7 more
2020medRxiv43 citations Open access
Semantic Scholar
Novel Microbiological and Spatial Statistical Methods to Improve Strength of Epidemiological Evidence in a Community-Wide Waterborne Outbreak
K. Jalava, Hanna Rintala, J. Ollgren, L. Maunula +20 more
2014PLoS ONE43 citations Open access
Semantic Scholar
Increase in Childhood Nontuberculous Mycobacterial Infections After Bacille Calmette-Guérin Coverage Drop: A Nationwide, Population-Based Retrospective Study, Finland, 1995–2016
Antti Kontturi, H. Soini, J. Ollgren, E. Salo
2018Clinical Infectious Diseases40 citations Open access
Semantic Scholar
Incidence and seroprevalence of tularaemia in Finland, 1995 to 2013: regional epidemics with cyclic pattern.
H. Rossow, J. Ollgren, J. Hytönen, H. Rissanen +4 more
2015Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin40 citations Open access
Semantic Scholar
Risk factors for pneumonic and ulceroglandular tularaemia in Finland: a population-based case-control study
H. Rossow, J. Ollgren, P. Klemets, I. Pietarinen +6 more
2013Epidemiology and Infection37 citations Open access
Semantic Scholar
The association of adverse events with bivalent human papilloma virus vaccination: A nationwide register-based cohort study in Finland.
J. Skufca, J. Ollgren, M. Artama, E. Ruokokoski +2 more
2018Vaccine36 citations Open access
Semantic Scholar
Nosocomial bloodstream infections caused by Escherichia coli and Klebsiella pneumoniae resistant to third-generation cephalosporins, Finland, 1999–2013: Trends, patient characteristics and mortality
T. Martelius, J. Jalava, T. Kärki, T. Möttönen +2 more
2016Infectious Diseases35 citations
Semantic Scholar
Mother-infant vaccination with pneumococcal polysaccharide vaccine: persistence of maternal antibodies and responses of infants to vaccination.
E. Holmlund, H. Nohynek, B. Quiambao, J. Ollgren +1 more
2011Vaccine34 citations
Semantic Scholar
Surveillance and outbreak report Outbreak of Yersinia pseudotuberculosis O : 1 infection associated with raw milk consumption , Finland , spring 2014
T. Parn, S. Hallanvuo, S. Salmenlinna, A. Pihlajasaari +6 more
201533 citations
Semantic Scholar
Population-based Borrelia burgdorferi sensu lato seroprevalence and associated risk factors in Finland.
Janko van Beek, Eeva Sajanti, O. Helve, J. Ollgren +5 more
2017Ticks and Tick-borne Diseases31 citations
Semantic Scholar
Impact of five years of rotavirus vaccination in Finland - And the associated cost savings in secondary healthcare.
T. Leino, U. Baum, Peter Scott, J. Ollgren +1 more
2017Vaccine28 citations Open access
Semantic Scholar
Illness and injury of travellers abroad: Finnish nationwide data from 2010 to 2012, with incidences in various regions of the world.
H. Siikamaki, P. Kivelä, M. Fotopoulos, J. Ollgren +1 more
2015Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin28 citations Open access
Semantic Scholar
Community- and Healthcare-Associated Clostridium difficile Infections, Finland, 2008−2013
S. Kotila, S. Mentula, J. Ollgren, A. Virolainen-Julkunen +1 more
2016Emerging Infectious Diseases26 citations Open access
Semantic Scholar
Clinical characteristics and population‐based attack rates of respiratory syncytial virus versus influenza hospitalizations among adults—An observational study
R. Auvinen, R. Syrjänen, J. Ollgren, H. Nohynek +1 more
2021Influenza and Other Respiratory Viruses24 citations Open access
Semantic Scholar
Agricultural, socioeconomic and environmental variables as risks for human verotoxigenic Escherichia coli (VTEC) infection in Finland
K. Jalava, J. Ollgren, M. Eklund, A. Siitonen +1 more
2011BMC Infectious Diseases24 citations Open access
Semantic Scholar
Benchmarking antibiotic use in Finnish acute care hospitals using patient case-mix adjustment.
M. Kanerva, J. Ollgren, O. Lyytikäinen
2011Journal of Antimicrobial Chemotherapy24 citations
Semantic Scholar
Population-based seroprevalence of Puumala hantavirus in Finland: smoking as a risk factor
F. Latronico, S. Maki, H. Rissanen, J. Ollgren +3 more
2018Epidemiology and Infection23 citations Open access
Semantic Scholar
Fever in travelers returning from malaria-endemic areas: don't look for malaria only.
H. Siikamäki, P. Kivelä, P. Sipilä, Annika Kettunen +3 more
2011Journal of Travel Medicine23 citations Open access
Semantic Scholar
Genomic Characteristics Behind the Spread of Bacteremic Group A Streptococcus Type emm89 in Finland, 2004–2014
Francesca Latronico, Waleed Nasser, Kai Puhakainen, J. Ollgren +6 more
2016Journal of Infectious Diseases22 citations Open access
Semantic Scholar
Antimicrobial prescribing in nursing homes in Finland: results of three point prevalence surveys
M. Rummukainen, T. Kärki, M. Kanerva, M. Haapasaari +2 more
2013Infection22 citations
Semantic Scholar
Public health response to large influx of asylum seekers: implementation and timing of infectious disease screening
P. Tiittala, K. Tuomisto, T. Puumalainen, O. Lyytikäinen +3 more
2018BMC Public Health21 citations Open access
Semantic Scholar
Intensified hand-hygiene campaign including soap-and-water wash may prevent acute infections in office workers, as shown by a recognized-exposure -adjusted analysis of a randomized trial
T. Hovi, J. Ollgren, C. Savolainen-Kopra
2017BMC Infectious Diseases21 citations Open access
Semantic Scholar
Evaluation of the Intussusception Risk after Pentavalent Rotavirus Vaccination in Finnish Infants
T. Leino, J. Ollgren, N. Strömberg, U. Elonsalo
2016PLoS ONE21 citations Open access
Semantic Scholar
Association between first language and SARS-CoV-2 infection rates, hospitalization, intensive care admissions and death in Finland: a population-based observational cohort study
Ville Holmberg, H. Salmi, Salla Kattainen, J. Ollgren +8 more
2021Clinical Microbiology and Infection20 citations Open access
Semantic Scholar
Climatic, ecological and socioeconomic factors as predictors of Sindbis virus infections in Finland
K. Jalava, J. Sane, J. Ollgren, R. Ruuhela +7 more
2012Epidemiology and Infection20 citations Open access
Semantic Scholar
Epidemic sindbis virus infection in Finland: a population-based case-control study of risk factors.
J. Sane, Sandra Guedes, J. Ollgren, S. Kurkela +5 more
2011Journal of Infectious Diseases20 citations Open access
Semantic Scholar
Rodent host population dynamics drive zoonotic Lyme Borreliosis and Orthohantavirus infections in humans in Northern Europe
Mahdi Aminikhah, J. Forsman, E. Koskela, T. Mappes +4 more
2021Scientific Reports19 citations Open access
Semantic Scholar
Incidence rates of Guillain Barré (GBS), chronic fatigue/systemic exertion intolerance disease (CFS/SEID) and postural orthostatic tachycardia syndrome (POTS) prior to introduction of human papilloma virus (HPV) vaccination among adolescent girls in Finland, 2002–2012
J. Skufca, J. Ollgren, E. Ruokokoski, O. Lyytikäinen +1 more
2017Papillomavirus Research19 citations Open access
Semantic Scholar
Influenza-associated hospitalisations in Finland from 1996 to 2010: unexpected age-specific burden during the influenza A(H1N1)pdm09 pandemic from 2009 to 2010.
A. Jacks, J. Ollgren, T. Ziegler, O. Lyytikainen
2012Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin19 citations Open access
Semantic Scholar
Coincidental detection of the first outbreak of carbapenemase-producing Klebsiella pneumoniae colonisation in a primary care hospital, Finland, 2013.
M. Kanerva, K. Skogberg, K. Ryynanen, A. Pahkamaki +4 more
2015Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin18 citations Open access
Semantic Scholar
Increasing proportions of extended-spectrum β-lactamase-producing isolates among Escherichia coli from urine and bloodstream infections: results from a nationwide surveillance network, Finland, 2008 to 2019
Heikki Ilmavirta, J. Ollgren, Kati Räisänen, T. Kinnunen +3 more
2023Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin17 citations Open access
Semantic Scholar
Prevalence of obesity and disturbances in glucose homeostasis in HIV‐infected subjects and general population – missed diagnoses of diabetes?
A. Hanttu, K. Kauppinen, P. Kivelä, J. Ollgren +4 more
2020HIV Medicine17 citations Open access
Semantic Scholar
Success ofrotavirus vaccination in Finland, a register based study measuring impact beyond overall effectiveness.
A. Solastie, T. Leino, J. Ollgren
2020Vaccine16 citations Open access
Semantic Scholar
Alarming development of dual snus and cigarette usage among young Finnish males
M. Danielsson, A. Lammi, S. Siitonen, J. Ollgren +2 more
2019BMC Public Health15 citations Open access
Semantic Scholar
Recurrent tuberculosis in Finland 1995–2013: a clinical and epidemiological cohort study
V. Korhonen, H. Soini, Tuula Vasankari, J. Ollgren +2 more
2017BMC Infectious Diseases15 citations Open access
Semantic Scholar
Invasive pneumococcal disease in patients with haematological malignancies before routine use of conjugate vaccines in Finland
Vesa Lindström, J. Aittoniemi, O. Lyytikäinen, P. Klemets +4 more
2016Infectious Diseases15 citations
Semantic Scholar
Tuberculosis in immigrants in Finland, 1995–2013
P. Räisänen, H. Soini, Tuula Vasankari, P. Smit +4 more
2015Epidemiology and Infection15 citations Open access
Semantic Scholar
Treatment outcome of extra-pulmonary tuberculosis in Finland: a cohort study
Tuula Vasankari, P. Holmström, J. Ollgren, K. Liippo +1 more
2010BMC Public Health15 citations Open access
Semantic Scholar
Early deaths in bloodstream infections: a population-based case series
Keiju S. K. Kontula, K. Skogberg, J. Ollgren, A. Järvinen +1 more
2016Infectious Diseases14 citations
Semantic Scholar
Regional differences in long-term cycles and seasonality of Puumala virus infections, Finland, 1995–2014
J. Sane, J. Ollgren, P. Makary, O. Vapalahti +2 more
2016Epidemiology and Infection14 citations Open access
Semantic Scholar
Estimating the burden of healthcare-associated infections caused by selected multidrug-resistant bacteria Finland, 2010
M. Kanerva, J. Ollgren, A. Hakanen, O. Lyytikäinen
2012Antimicrobial Resistance and Infection Control14 citations Open access
Semantic Scholar

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A. Järvinen — researcher profile on SciRah