I am groupleader for the BRuSH research group at the Department of Clinical Science at the University of Bergen. I have a background from evolutionary biology and ecology (MSc) from the University of Bergen and from Environmental Medicine and Epidemiology from the Norwegian Institute of Public Health and University of Oslo (PhD).

In 2010 I was awarded Voksentoppen Research Award within paediatric allergology and pulmonology, and in 2018 I received Kronprins Haakons research award for asthma and allergy.

My main research interests are on environmental exposure, microbiome and asthma and allergy. The Young Research Talent grant (RCN-funded) focused on exposure to antibacterial chemicals, oral microbiome and lung health.

I was awarded an European Research Council (ERC) starting grant for the project "BRuSH" (2019-2025). In this research project we explored how bacteria that produce particularly potent proinflammatory lipid As (the component responsible for inflammation in the host) affects lung health and disease over time. The project focused on bacteria (microbiome) in the environment as well as in the human body.

I have a shared researcher position between University of Bergen and Oral Health Centre of Expertise, where I have collaborators with dental background, which is valuable collaborators in the projects exploring oral and respiratory health. I am PI and biobank manager for RHINESSA Bergen centre (www.rhinessa.net).

My professional committments include

• Appointed member in the National Committee for Medical and Health Research Ethics (NEM) by the Ministry of Education and Research from 2014-2022
• Associate editor of International Journal of Hygiene and Environmental Health since 2017-2023
• Vice chair for COST Action CA18131 (2019-2023): Statistical and machine learning techniques in human microbiome studies
• Appointed member of the Scientific advisory board of the Leibniz ScienceCampus Evolutionary Medicine of the Lung (EVOLUNG) http://evolung.fz-borstel.de/  2018-2023

A successful track record for research funding includes grants such as 

• Research Council of Norway (RCN) Personal Postdoctoral Grant
• U.S.-Norway Fulbright Foundation for Educational Exchange Fellowship
• The Norwegian Asthma- and Allergy Foundation
• RCN Young Research Talent grant
• RCN Research Project from 2017 (BETTERHEALTH)
• ERC Starting Grant 2018
• Nordforsk (Antimicrobial reistance genes) 2023
• CAMRIA network: Surveillance and tracking of AMR 2022

Healthy lungs start from your toothbrush European Reaserch Council - World Microbiome Day

Phthalates and Childhood Asthma Environmental health perspectives - podcast

Housedust mite and allergies [in Norwegian]

Chemicals in toothpaste and cosmetics and risk on allergi [In Norwegian] 

Cat allergens and asthma risk [In Norwegian]

 

Academic article

• Simone Accordini; Lucia Calciano; Ane Johannessen et al. (2021). Prenatal and prepubertal exposures to tobacco smoke in men may cause lower lung function in future offspring: a three-generation study using a causal modelling approach. (external link)
• Gro Tjalvin; Øistein Svanes; Randi Jacobsen Bertelsen et al. (2018). Hypersensitivity pneumonitis in fish processing workers diagnosed by inhalation challenge. (external link)
• Hesham Amin Mohamed Abouelhana; Tina Šantl-Temkiv; Christine Cramer et al. (2023). Indoor Airborne Microbiome and Endotoxin: Meteorological Events and Occupant Characteristics Are Important Determinants. (external link)
• Hesham Amin Mohamed Abouelhana; Tina Šantl-Temkiv; Christine Cramer et al. (2022). Cow Farmers’ Homes Host More Diverse Airborne Bacterial Communities Than Pig Farmers’ Homes and Suburban Homes. (external link)
• Randi Jacobsen Bertelsen; KC Lødrup Carlsen; Kai-Håkon Carlsen et al. (2010). Childhood asthma and early life exposure to indoor allergens, endotoxin and beta(1,3)-glucans. (external link)
• Signe Timm; Morten Frydenberg; Michael J. Abramson et al. (2019). Asthma and selective migration from farming environments in a three-generation cohort study. (external link)
• Gro Tjalvin; Øistein Svanes; Jannicke Igland et al. (2021). Maternal preconception occupational exposure to cleaning products and disinfectants and offspring asthma. (external link)
• Hilde Kristin Vindenes; Cecilie Svanes; Stein Håkon Låstad Lygre et al. (2021). Exposure to environmental phenols and parabens, and relation to body mass index, eczema and respiratory outcomes in the Norwegian RHINESSA study. (external link)
• Antonio Manuel Perez Barrionuevo; Francisco Gomez Real; Jannicke Igland et al. (2018). Periodontal Health status and lung function in two Norwegian cohorts. (external link)
• Shanshan Xu; Alessandro Marcon; Randi Jacobsen Bertelsen et al. (2024). Associations of long-term exposure to air pollution and greenness with incidence of chronic obstructive pulmonary disease in Northern Europe: The Life-GAP project. (external link)
• S. Zaigham; Randi Jacobsen Bertelsen; S.C. Dharmage et al. (2024). An observational analysis on the influence of parental allergic rhinitis, asthma and smoking on exhaled nitric oxide in offspring. (external link)
• Ane Johannessen; Marianne Lønnebotn; Lucia Calciano et al. (2019). Being overweight in childhood, puberty, or early adulthood: Changing asthma risk in the next generation?. (external link)
• Þórarinn Gíslason; Randi Jacobsen Bertelsen; Francisco Gomez Real et al. (2016). Self-reported exposure to traffic pollution in relation to daytime sleepiness and habitual snoring: a questionnaire study in seven North-European cities. (external link)
• Monica Cheng Munthe-Kaas; Randi Jacobsen Bertelsen; Tale Mæhre Torjussen et al. (2012). Pet keeping and tobacco exposure influence CD14 methylation in childhood. (external link)
• Virginia T. Guidry; Matthew P. Longnecker; Heidi Aase et al. (2015). Measurement of total and free urinary phenol and paraben concentrations over the course of pregnancy: assessing reliability and contamination of specimens in the Norwegian Mother and Child Cohort Study. (external link)
• Kathrine Pape; Cecilie Svanes; Andrei Malinovschi et al. (2019). Agreement of offspring-reported parental smoking status: the RHINESSA generation study. (external link)
• Hesham Amin Mohamed Abouelhana; Randi Jacobsen Bertelsen; Christine Cramer et al. (2025). Airborne Microbial Signatures of Sleep Apnea Risk: Enrichment of Human-Associated and Loss of Environmental Taxa. (external link)
• Øistein Svanes; Randi Jacobsen Bertelsen; Stein Håkon Låstad Lygre et al. (2018). Cleaning at home and at work in relation to lung function decline and airway obstruction. (external link)
• Randi Jacobsen Bertelsen; Stephanie M. Engel; Todd A. Jusko et al. (2014). Reliability of triclosan measures in repeated urine samples from Norwegian pregnant women. (external link)
• Jale Moradi; Ellen Berggreen; Dagmar Fosså Bunæs et al. (2025). Microbiome composition and metabolic pathways in shallow and deep periodontal pockets. (external link)
• Kai Philipp Triebner; Iana Markevych; Randi Jacobsen Bertelsen et al. (2022). Lifelong exposure to residential greenspace and the premenstrual syndrome: A population-based study of Northern European women. (external link)
• Maryia Khomich; Huang Lin; Andrei Malinovschi et al. (2023). Association between lipid-A-producing oral bacteria of different potency and fractional exhaled nitric oxide in a Norwegian population-based adult cohort. (external link)
• Randi Jacobsen Bertelsen; Christine Instanes; Berit Granum et al. (2010). Gender differences in indoor allergen exposure and association with current rhinitis. (external link)
• Hilde Kristin Vindenes; Cecilie Svanes; Stein Håkon Låstad Lygre et al. (2017). Prevalence of, and work-related risk factors for, hand eczema in a Norwegian general population (The HUNT Study). (external link)
• Iana Markevych; Tianyu Zhao; Elaine Fuertes et al. (2023). Residential greenspace and lung function decline over 20 years in a prospective cohort: The ECRHS study. (external link)
• Randi Jacobsen Bertelsen; Marta Rava; Anne Elie Carsin et al. (2017). Clinical markers of asthma and IgE assessed in parents before conception predict asthma and hayfever in the offspring. (external link)
• Svein Magne Skulstad; Jannicke Igland; Ane Johannessen et al. (2017). Validation of maternal reported pregnancy and birth characteristics against the Medical Birth Registry of Norway. (external link)
• Elinor Margrethe Chelsom Vogt; Francisco Gomez Real; Eystein Sverre Husebye et al. (2022). Premature menopause and autoimmune primary ovarian insufficiency in two international multi-center cohorts. (external link)
• Jane A. Hoppin; Renee Jaramillo; Stephanie J. London et al. (2013). Phthalate Exposure and Allergy in the US Population: Results from NHANES 2005-2006. (external link)
• Randi Jacobsen Bertelsen; Christiane Kruse Fæste; Berit Granum et al. (2014). Food allergens in mattress dust in Norwegian homes - a potentially important source of allergen exposure. (external link)
• Marie Kjær Madsen; Vivi Schlünssen; Cecilie Svanes et al. (2022). The effect of farming environment on asthma; time dependent or universal?. (external link)
• Cecilie Svanes; Ane Johannessen; Randi Jacobsen Bertelsen et al. (2022). Cohort profile: the multigeneration Respiratory Health in Northern Europe, Spain and Australia (RHINESSA) cohort. (external link)
• Karsten Königstein; Denis Infanger; Randi Jacobsen Bertelsen et al. (2019). Is atopic sensitization associated with indicators of early vascular ageing in adolescents?. (external link)
• Robin Mzati Sinsamala; Ane Johannessen; Randi Jacobsen Bertelsen et al. (2024). Pregnancy outcomes as related to in utero exposure to air pollution and greenness: The Life-GAP Project. (external link)
• Oda Cecilie Carlsen; Hrefna Katrín Gudmundsdóttir; Karen Eline Stensby Bains et al. (2021). Physical activity in pregnancy: a Norwegian-Swedish mother-child birth cohort study. (external link)
• Hans Rostad; Anne Naalsund; T.E. Strand et al. (2005). Results of pulmonary resection for lung cancer in Norway, patients older than 70 years. (external link)
• Anders Røsland; Randi Jacobsen Bertelsen; Joachim Heinrich et al. (2025). Effect of periodontal therapy on lung function: a twelve-month follow-up intervention study. (external link)
• Randi Jacobsen Bertelsen; Antonio Manuel Perez Barrionuevo; Rajesh Shigdel et al. (2022). Association of oral bacteria with oral hygiene habits and self-reported gingival bleeding. (external link)
• Ingrid Nordeide Kuiper; Cecilie Svanes; Iana Markevych et al. (2021). Lifelong exposure to air pollution and greenness in relation to asthma, rhinitis and lung function in adulthood. (external link)
• Hilde Kristin Vindenes; Christine Dregenes; Hesham Amin Mohamed Abouelhana et al. (2023). The impact of alcohol-based hand sanitiser and hand washing with soap and water on bacterial skin microbiota composition. (external link)
• Hilde Kristin Vindenes; Christine Dregenes; Hesham Amin Mohamed Abouelhana et al. (2024). Longitudinal analysis of the skin microbiome in association with hand eczema, hand hygiene practices and moisturizer use. (external link)
• Francisco Gomez Real; Laura Perez Barrionuevo; K. Franklin et al. (2016). The Association of gum bleeding With respiratory Health in a population based study from Northern Europe. (external link)
• Randi Jacobsen Bertelsen; M P Longnecker; Martinus Løvik et al. (2013). Triclosan exposure and allergic sensitization in Norwegian children. (external link)
• Ingrid Nordeide Kuiper; Cecilie Svanes; Bryndís Benediktsdóttir et al. (2018). Agreement in reporting of asthma by parents or offspring - the RHINESSA generation study. (external link)
• Kai Triebner; Ane Johannessen; Luca Puggini et al. (2016). Menopause as a predictor of new-onset asthma: A longitudinal Northern European population study. (external link)
• Randi Jacobsen Bertelsen; Anne Lise Brantsæter; Maria Christine Magnus et al. (2014). Probiotic milk consumption in pregnancy and infancy and subsequent childhood allergic diseases. (external link)
• Nils Oskar Jögi; Negusse Kitaba; Torgeir Storaas et al. (2022). Ascaris exposure and its association with lung function, asthma, and DNA methylation in Northern Europe. (external link)
• Gerd Toril Mørkve Knudsen; Shyamali C. Dharmage; Christer Janson et al. (2020). Parents’ smoking onset before conception as related to body mass index and fat mass in adult offspring: Findings from the RHINESSA generation study. (external link)
• Rajesh Shigdel; Ane Johannessen; Huang Lin et al. (2023). Oral bacterial composition associated with lung function and lung inflammation in a community-based Norwegian population. (external link)
• Nils Oskar Jögi; Robin Kleppe Olsen; Cecilie Svanes et al. (2019). Prevalence of allergic sensitization to storage mites in Northern Europe. (external link)
• Christian Madsen; Gerard Hoek; Bente Margaret Oftedal et al. (2007). Modeling the intra-urban variability of outdoor traffic pollution in Oslo, Norway - A GA(2)LEN project. (external link)
• Christine Dregenes; Hesham Amin Mohamed Abouelhana; Tuva Norderud Jensen et al. (2025). Longitudinal impact of oral bacteria and endotoxin on lung function. (external link)
• Anders Flataker Viken; Judith Garcia-Aymerich; Christer Janson et al. (2025). Is more muscle mass linked to less hypertension? Exploring sex-specific effects and the role of body composition in older European adults. (external link)
• Hilde Kristin Vindenes; Randi Jacobsen Bertelsen; Stein Håkon Lygre et al. (2023). Changes in Infection Prevention Practices and Occurrence of Skin Symptoms among Healthcare Workers, Cleaners and Day-care Workers in Norway during the COVID-19 Pandemic. (external link)
• Randi Jacobsen Bertelsen; Karin C. Lødrup Carlsen; Kai-Håkon Carlsen (2010). Rhinitis in children: Co-morbidities and phenotypes. (external link)
• Randi Jacobsen Bertelsen; Karin C. Lødrup Carlsen; Antonia M. Calafat et al. (2013). Urinary biomarkers for phthalates associated with asthma in Norwegian children. (external link)
• Anders Flataker Viken; Silver Peeter Siiak; Vivi Schlünssen et al. (2024). Muscle Strength and Male Sexual Function. (external link)
• Simone Accordini; Lucia Calciano; Ane Johannessen et al. (2018). A three-generation study on the association of tobacco smoking with asthma. (external link)
• Anette Kocbach Bølling; Jørn Andreas Holme; Carl Gustaf Bornehag et al. (2013). Pulmonary phthalate exposure and asthma - is PPAR a plausible mechanistic link?. (external link)
• Hesham Amin Mohamed Abouelhana; Ian P.G. Marshall; Randi Jacobsen Bertelsen et al. (2023). Optimization of bacterial DNA and endotoxin extraction from settled airborne dust. (external link)
• Robin Mzati Sinsamala; Alessandro Marcon; Randi Jacobsen Bertelsen et al. (2025). Associations of parental air pollution and greenness exposures with offspring asthma outcomes. (external link)
• Randi Jacobsen Bertelsen; Elizabeth T. Jensen; Tamar Ringel-Kulka (2016). Use of probiotics and prebiotics in infant feeding. (external link)
• Jan Kühnisch; Tianyu Zhao; Randi Jacobsen Bertelsen et al. (2023). The impact of gingivitis reduction on lung function: a randomized trial under intensified oral hygiene. (external link)
• Nils Oskar Jögi; Cecilie Svanes; Silver Peeter Siiak et al. (2018). Zoonotic helminth exposure and risk of allergic diseases: A study of two generations in Norway. (external link)
• Hilde Kristin Vindenes; Huang Lin; Rajesh Shigdel et al. (2022). Exposure to Antibacterial Chemicals Is Associated With Altered Composition of Oral Microbiome. (external link)
• Shanshan Xu; Alessandro Marcon; Randi Jacobsen Bertelsen et al. (2023). Long-term exposure to low-level air pollution and greenness and mortality in Northern Europe. The Life-GAP project. (external link)
• Mikyeong Lee; Hilde Kristin Vindenes; Farnaz Fouladi et al. (2025). Oral microbiota related to allergy in Norwegian adults. (external link)
• Gerd Toril Mørkve Knudsen; FI Rezwan; Ane Johannessen et al. (2019). Epigenome-wide association of father's smoking with offspring DNA methylation: A hypothesis-generating study. (external link)
• Juan Wang; Mihkel Pindus; Christer Janson et al. (2019). Dampness, mould, onset and remission of adult respiratory symptoms, asthma and rhinitis. (external link)
• Kathrine Pape; Cecilie Svanes; Camilla Sandal Sejbaek et al. (2020). Parental occupational exposure pre- and post-conception and development of asthma in offspring. (external link)
• Shanshan Xu; Alessandro Marcon; Randi Jacobsen Bertelsen et al. (2025). Long-term exposure to air pollution and greenness in association with respiratory emergency room visits and hospitalizations: The Life-GAP project. (external link)
• Juan Pablo Lopez Cervantes; Vivi Schlünssen; Chamara Senaratna et al. (2024). Use of oral moist tobacco (snus) in puberty and its association with asthma in the population-based RHINESSA study. (external link)
• Juan Pablo Lopez Cervantes; Rajesh Shigdel; S. Accordini et al. (2022). Parental TB associated with offspring asthma and rhinitis. (external link)
• Øistein Svanes; Trude Duelien Skorge; Ane Johannessen et al. (2015). Respiratory health in cleaners in Northern Europe: Is susceptibility established in early life?. (external link)
• Ingrid Nordeide Kuiper; Iana Markevych; Simone Accordini et al. (2020). Associations of preconception exposure to air pollution and greenness with offspring asthma and hay fever. (external link)
• Julia Dratva; Randi Jacobsen Bertelsen; Christer Janson et al. (2016). Validation of self-reported figural drawing scales against anthropometric measurements in adults. (external link)
• Signe Timm; Cecilie Svanes; Morten Frydenberg et al. (2020). Does parental farm upbringing influence the risk of asthma in offspring? A three-generation study.. (external link)
• Domenica D’Elia; Jaak Truu; Leo Lahti et al. (2023). Advancing microbiome research with machine learning: key findings from the ML4Microbiome COST action. (external link)
• Randi Jacobsen Bertelsen; KCL Carlsen; Berit Granum et al. (2010). Do allergic families avoid keeping furry pets?. (external link)
• Juan Wang; Christer Janson; Rain Jõgi et al. (2021). A prospective study on the role of smoking, environmental tobacco smoke, indoor painting and living in old or new buildings on asthma, rhinitis and respiratory symptoms. (external link)
• Dan Norbäck; JP Zock; E Plana et al. (2017). Building dampness and mold in European homes in relation to climate, building characteristics and socio-economic status: The European Community Respiratory Health Survey ECRHS II. (external link)
• Holly C. Y. Lam; Catherine Neukirch; Christer Janson et al. (2023). Food hypersensitivity: an examination of factors influencing symptoms and temporal changes in the prevalence of sensitization in an adult sample. (external link)
• Cecilie Svanes; Jennifer Koplin; Svein Magne Skulstad et al. (2016). Father’s environment before conception and asthma risk in his children: a multi-generation analysis of the Respiratory Health In Northern Europe study. (external link)
• Randi Jacobsen Bertelsen; Øistein Svanes; Anne Mette Madsen et al. (2016). Pulmonary illness as a consequence of occupational exposure to shrimp shell powder. (external link)
• Anders Røsland; Randi Jacobsen Bertelsen; Dagmar Fosså Bunæs et al. (2024). Periodontitis is associated with airflow obstruction in the Malmö Offspring Dental Study. (external link)

Conference abstract

• Randi Jacobsen; K Lødrup Carlsen; P Mowinckel et al. (2008). Do allergic families avoid having furry pets when children are small?. (external link)
• Randi Jacobsen; K Lødrup Carlsen; K Carlsen et al. (2009). Early life exposure to cat allergens increase the risk of late childhood asthma in a community with low levels of in-door allergens. (external link)
• Marianne Lønnebotn; Lucia Calciano; Ane Johannessen et al. (2017). Late Breaking Abstract- Mothers' preconception overweight and offspring asthma. (external link)
• Randi Jacobsen Bertelsen; Anne Lise Brantsæter; Alice Margaretha Haugen et al. (2013). Maternal Probiotic Intake and Respiratory and Allergy Outcomes in Early Childhood. (external link)
• Randi Jacobsen Bertelsen; Christiane Kruse Fæste; Berit Granum et al. (2013). Food allergens in mattress dust in Norwegian homes: a significant source of allergen exposure?. (external link)
• Anders Røsland; Dagmar Fosså Bunæs; Christine Drengenes et al. (2022). The association between periodontitis and pulmonary function based on the Malmö offspring dental study (MODS). (external link)

Letter to the editor

• Signe Timm; Vivi Schlünssen; Bryndís Benediktsdóttir et al. (2019). Offspring Reports on Parental Place of Upbringing: Is It Valid?. (external link)

Academic literature review

• Juan Pablo López Cervantes; Marianne Lønnebotn; Nils Oskar Jögi et al. (2021). The Exposome Approach in Allergies and Lung Diseases: Is It Time to Define a Preconception Exposome?. (external link)
• Cecilie Svanes; Randi Jacobsen Bertelsen; Simone Accordini et al. (2021). Exposures during the prepuberty period and future offspring's health: evidence from human cohort studies. (external link)

Conference lecture

• Randi Jacobsen Bertelsen; Christiane Kruse Fæste; Berit Granum et al. (2013). Food Allergens in Mattress Dust in Norwegian Homes: a Significant Source of Allergen Exposure?. (external link)
• Randi Jacobsen Bertelsen; Hesham Amin Mohamed Abouelhana (2023). Association between indoor bacterial communities, lung function and airway inflammation. (external link)

Popular science article

• Øistein Svanes; Trude Duelien Skorge; Randi Jacobsen Bertelsen et al. (2014). Astma og renholdsarbeidere: Resultater fra RHINE-studien.. (external link)

Doctoral thesis (PhD)

• Randi Jacobsen Bertelsen; Martinus Løvik; Berit Granum et al. (2010). The indoor environment and childhood allergic diseases : the importance of allergens and microbial components. (external link)

Conference poster

• Elin Helga Thorarinsdottir; Anders Flataker Viken; Silver Peeter Siiak et al. (2025). Sexual dysfunction in men with Obstructive Sleep Apnea: The role of Daytime Sleepiness in a population-based study. (external link)

Editorial/Leader article

• Domenica D'Elia; Aldert Zomer; Isabel Moreno Indias et al. (2024). Editorial: Microbiome and machine learning, volume II. (external link)

See a complete overview of publications in Cristin.

Publication statistics

• 97 publications in international peer-reviewed journals; h-index: 29, Citations: 2585 (Web of science, Jan 2026)
• 11 publications in Norwegian journals for health personnel
• Book chapter: Jensen ET, Bertelsen RJ, Ringel Kulka T. “The Microbiota of the Gastrointestinal Tract in Infancy”, book chapter in “The Microbiota in Gastrointestinal Pathophysiology: Implications for Human Health, Prebiotics, Probiotics and Dysbiosis” 1^st Edition November 2016. Elsevier. ISBN: 9780128040249.
• 15 popular science interviews (newspapers, TV, radio)

Many of Randi J Bertelsen's publications are Open Access, and her updated publication record can be found at: 

ResearcherID

Orcid

Scopus

Google Scholar Citations

ResearchGate

 

10 Representative Publications

1. Amin H, Šantl-Temkiv T, Cramer C, Finster K, Real FG, Gislason T, Holm M, Janson C, Jögi NO, Jogi R, Malinovschi A, Marshall IPG, Modig L, Norbäck D, Shigdel R, Sigsgaard T, Svanes C, Thorarinsdottir H, Wouters IM, Schlünssen V, Bertelsen RJ. Indoor Airborne Microbiome and Endotoxin: Meteorological Events and Occupant Characteristics Are Important Determinants. Environ Sci Technol. 2023 15;57(32):11750-11766. doi: 10.1021/acs.est.3c01616.
2. Shigdel R, Johannessen A, Lin H, Peddada S, Gómez Real F, Ringel-Kulka T, Svanes C, Bertelsen RJ. Oral bacterial composition associated with lung function and lung inflammation in a community-based Norwegian population. Respir Res. 2023 12;24(1):183. doi: 10.1186/s12931-023-02491-6.
3. Jõgi NO, Svanes C, Siiak SP, Logan E, Holloway JW, Igland J, Johannessen A, Levin M, Real FG, Schlunssen V, Horsnell WGC, Bertelsen RJ (2018) Zoonotic helminth exposure and risk of allergic diseases: A study of two generations in Norway. Clin Exp Allergy; 48(1):66-77.
4. Vindenes HK, Lin H, Shigdel R, Ringel-Kulka T, Real FG, Peddada SD, Svanes C, Bertelsen RJ. Exposure to antibacterial chemicals is associated with altered composition of oral microbiome. Frontiers of Microbiology. 2022. 28;13:790496. doi: 10.3389/fmicb.2022.790496. eCollection 2022.
5. Pérez Barrionuevo AM, Gómez Real F, Igland J, Johannessen A, Omenaas E, Franklin KA, Pérez Barrionuevo L, Åstrøm AN, Svanes C, Bertelsen RJ (2018) Periodontal health status and lung function in two Norwegian cohorts. PLoS One; 13(1):e0191410
6. Bertelsen RJ, Rava M, Casin AE, Accordini S, Benediktsdottir B, Dratva J, Franklin KA, Heinrich J, Holm M, Janson C, Johannessen A, Jarvis DL, Jogi R, Leyneart B, Norback D, Omenaas ER, Raherison C, Sánchez-Ramos JL, Schlunssen V, Sigsgaard T, Dharmage SC, Svanes C (2017) Parental asthmatic and allergic activity before conception predicts asthma and allergy in the offspring. Clin Exp Allergy; 47(5): 627-638.
7. Bertelsen RJ, Jensen ET, Ringel-Kulka T (2016). Use of probiotics and prebiotics in infant feeding. Best Pract Res Clin Gastroenterol; 30(1):39-48.
8. Bertelsen RJ, Brantsæter AL, Magnus M, Haugen M, Myhre R, Jacobsson B, Longnecker MP, Meltzer HM, London SJ (2014) Probiotic milk consumption in pregnancy and infancy and subsequent childhood allergic disease. J Allergy Clin Immunol 133(1):165-171..
9. Bertelsen RJ, Lødrup-Carlsen KC, Calafat AM, Hoppin JA, Haland G, Mowinckel P, Carlsen KH, Løvik M (2013). Urinary Biomarkers for Phthalates Associated with Asthma in Norwegian Children. Environ Health Perspect 121(2):251-256. Featured as a Science Selection in the February Issue of EHP: http://ehp.niehs.nih.gov/2013/02/121-a59/
10. Bertelsen RJ, Longnecker MP, Løvik M, Calafat AM, Carlsen K‐H, London SJ, Lødrup Carlsen KC. Triclosan exposure and allergic sensitization in Norwegian children (2013) Allergy; 68 (1): 84-91. 

2023 Research project "Pesticides and exposures from traditional textile industry associated with own and offspring health in indigenous Guatemalan communities" – WP Leader for WP4: Exposure assessment – Research Council of Norway

2023 Reseach project "Tracking of Antimicrobial Resistant Genes in Environmental reservoirs in the Nordic countries"- Principal investigator (PI) – NordForsk

2022 Research project "Surveillance and Metagenomic tracking of Antimicrobial Resistance Genes IN environmental and clinical samples using machine learning approaches" - PI – Trond Mohn Foundation (CAMRIA-network) 

2021 Researcher project "Oral health in adults: predictors, social gradients and correlation with cardiovascular health in women and men" - WP PI - Research Council of Norway; project owner: Oral Health Centre of Expertice/TKVestland

2019 ERC Starting Grant: “Oral bacteria as determinants for respiratory health” - PI - European Research Council (ERC); Project owner: University of Bergen

2018 Researcher project: “Oral and Environmental Microbiome, Endotoxin and Lung Health; the ‘United Airways’ concept extended” - PI - Research Council of Norway; Project owner: University of Bergen

2017 Reseracher project: “Housedust mite prevalence in Western Norway” - PI - The Norwegian Asthma and Allergy Foundation; Project owner: Haukeland University Hospital