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Øystein Haarklau Johansen

Observed names: Johansen, Øystein Haarklau, Ø. H. JOHANSEN, Ø.H. Johansen, Øystein H Johansen, Øystein H. Johansen, Øystein Haarklau Johannsen
ORCID: 0000-0001-6020-7802
Observed ORCID: 0000-0001-6020-7802
OpenAlex ID: A5020496903
Cryptosporidium Infections in Africa—How Important Is Zoonotic Transmission? A Review of the Evidence
2020 · Lucy J. Robertson, Øystein Haarklau Johansen, et al. · Frontiers in Veterinary Science · 85
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Second outbreak of infection with a rareCryptosporidium parvumgenotype in schoolchildren associated with contact with lambs/goat kids at a holiday farm in Norway
2013 · H. LANGE, Ø. H. JOHANSEN, et al. · Epidemiology and Infection · 59
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An outbreak of gastroenteritis among schoolchildren staying in a wildlife reserve: Thorough investigation reveals Norway’s largest cryptosporidiosis outbreak
2011 · Gražina Rimšelienė, Line Vold, et al. · Scandinavian Journal of Public Health · 40
Performance and operational feasibility of two diagnostic tests for cryptosporidiosis in children (CRYPTO-POC): a clinical, prospective, diagnostic accuracy study
2020 · Øystein H Johansen, Alemseged Abdissa, et al. · The Lancet Infectious Diseases · 32
Prolonged empirical antibiotic therapy is correlated with bloodstream infections and increased mortality in a tertiary care hospital in Ethiopia: bacteriology testing matters
2020 · Makeda Semret, Workeabeba Abebe, et al. · JAC-Antimicrobial Resistance · 27
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Symptomatic and asymptomatic secondary transmission of Cryptosporidium parvum following two related outbreaks in schoolchildren
2014 · Ø. H. JOHANSEN, K. HANEVIK, et al. · Epidemiology and Infection · 27
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Gut microbiota patterns associated with duration of diarrhea in children under five years of age in Ethiopia
2024 · Getnet Tesfaw, Dawd S. Siraj, et al. · Nature Communications · 23
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Cryptosporidium species and subtypes in Norway: predominance of C. parvum and emergence of C. mortiferum
2024 · Jahid Hasan Tipu, Audun Sivertsen, et al. · Emerging Microbes & Infections · 21
A Feasible Laboratory-Strengthening Intervention Yielding a Sustainable Clinical Bacteriology Sector to Support Antimicrobial Stewardship in a Large Referral Hospital in Ethiopia
2020 · Cedric P. Yansouni, Daniel Seifu, et al. · Frontiers in Public Health · 18
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Prevalence and assemblage of Giardia duodenalis in a case-control study of children under 5 years from Jimma, Southwest Ethiopia
2023 · Yonas Alemu, Alemseged Abdissa, et al. · Parasitology Research · 13
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Oocyst Shedding Dynamics in Children with Cryptosporidiosis: a Prospective Clinical Case Series in Ethiopia
2022 · Øystein H. Johansen, Alemseged Abdissa, et al. · Microbiology Spectrum · 10
Critical evaluation of the appetite test for children with severe acute malnutrition
2019 · Mike Zangenberg, Alemseged Abdissa, et al. · Tropical Medicine & International Health · 10
Cryptosporidium infection and associated factors among diarrheic children under five years of age in Eastern Ethiopia
2025 · Degu Abate, Rea Tschopp, et al. · PLoS neglected tropical diseases · 8
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Prolonged and persistent diarrhoea is not restricted to children with acute malnutrition: an observational study in Ethiopia
2019 · Mike Zangenberg, Øystein H. Johansen, et al. · Tropical Medicine & International Health · 7
A comparison of risk factors for cryptosporidiosis and non-cryptosporidiosis diarrhoea: A case-case-control study in Ethiopian children
2022 · Øystein Haarklau Johansen, Alemseged Abdissa, et al. · PLoS neglected tropical diseases · 6
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Metronidazole-sensitive organisms in children with severe acute malnutrition: an evaluation of the indication for empiric metronidazole treatment
2019 · M. Zangenberg, A. Abdissa, et al. · Clinical Microbiology and Infection · 4
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Genetic diversity of Cryptosporidium isolates from young children and livestock in eastern Ethiopia
2025 · Degu Abate, Rea Tschopp, et al. · Current Research in Parasitology and Vector-Borne Diseases · 2
Bakterier og andre mikroorganismer
2013 · Øystein Haarklau Johansen · Tidsskrift for Den norske legeforening · 2
Diagnostic Methods for Cryptosporidiosis in Low- and Middle-Income Countries: A Systematic Narrative Review
2026 · Tewachew Awoke, Asnake Simieneh, et al. · The Journal of Infectious Diseases · 1
Evaluation of rectal swab compared with bulk stool sampling for detection of Cryptosporidium infection by light-emitting diode auramine-phenol microscopy in young children with diarrhoea
2025 · Degu Abate, Lucy J. Robertson, et al. · Clinical Microbiology and Infection · 1
Works count: 23
Citation count: 396
H-index: 10
I10-index: 12
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