Current Members

Marie-Claire Arrieta, Ph.D

Websites: Linkedin, ResearchGate, Pubmed


Originally trained as a medical microbiologist in San José, Costa Rica, Claire moved to Canada to pursue graduate studies. She completed M.Sc and PhD programs at the University of Alberta in Edmonton, Alberta. Her doctoral work explored the role of intestinal permeability (leaky gut) in the pathogenesis of inflammatory bowel disease. Through her work, she became very interested in the concept of the gut as the engine of diseases that occur in organs far away from the gut. Following this, she completed a postdoctoral fellowship in the laboratory of Dr. Brett Finlay's, a prominent molecular microbiologist that has pioneered many studies in the field of the human microbiome. During her postdoctoral stay, Claire studied the relationship between the gut microbiome, the gut's immune system and asthma, a disease of the lungs. Besides her time spent in research, Claire is also very interested in science communication to the public. She has written one public book (Let Them Eat Dirt), and is currently working on a second book (a children's book), as well as on a documentary film project.

Erik van Tilburg Bernardes, M.Sc

Websites: Linkedin, Pubmed


After working for two years as the Research Associate in the Arrieta lab, Erik is changing his role in the lab and starting his Ph.D under Dr. Marie-Claire Arrieta's supervision. As the first addition to the lab, he has helped Claire immensely to set up the space and get the laboratory up and running. Erik holds both a Masters of Science in Microbiology and Infectious Diseases (2014-2017), from the University of Calgary, and a Bachelor in Pharmacy (2008-2014), by the Federal University of Alfenas (Unifal-MG, Brazil). His scientific career started in his undergraduate years in Brazil and later brought him to Calgary, working in different projects that aimed to study/identify alternative treatment options for the bacterial pathogen Pseudomonas aeruginosa. Erik's previous experience include different molecular, physiological and immunological techniques, which combined with his expertise in pharmacology and microbiology make him an invaluable asset for the team. His interests include the interactions between host and microorganisms, and Erik is keen to learn more on how these interactions shape the host's immune system and finally prevent/predispose individuals to developing diseases.

Dr. Jumana Samara, M.D

Website: ResearchGate


Jumana graduated from Medical School with a specialization in paediatrics after a residency-training program in Syria. Since 2015, she has been participating in a neonatal perinatal medicine program, taking care of sick newborn infants including preterm and low birth weight babies. She followed additional training in epidemiology at the University of Manitoba (2012-2013), and attended successfully the course of Quality Improvement and Patients Safety at the University of Calgary (2016-2017). One of the greatest challenges in her career is the infectious diseases targeting infants with weakened immune system. Her commitment toward her patients is to provide the best care, even beyond the discharge from Neonatal Intensive Care Unit. She recently started a Masters degree in Microbiology and Infectious Diseases with Dr. Arrieta. Her project aims to study the gut physiology and microbiome dynamics in preterm infants as well as the role of probiotics and how it contributes to childhood wellbeing.

Veronika K. Pettersen, Ph.D.

Websites: ResearchGate, LinkedIn, Google Scholar, Blog


Veronika is a researcher from the University of Tromsø, Norway, who is visiting Claire’s lab from July 2018 to June 2020. The Research Council of Norway funds her stay at the University of Calgary via the FRIPRO mobility research grant program co-funded by the European Union’s Seventh Framework Program under Marie Curie grant. Veronika studied biochemistry in Czech Republic (University of Chemistry and Technology) and biotechnology in Denmark (Technical University of Denmark) and Norway (Norwegian University of Science and Technology). After her Ph.D. project, Veronika joined the Gade Research Group for Infection and Immunity, University of Bergen, where she specialized in microbial proteomics and genomics. She is currently affiliated with the Pediatric Infection group at UiT - The Arctic University of Norway. Her research interests lie in microbial metabolism, host-microbe communication, and consequences of drug-driven alterations of the gut microbiota. In the Arrieta lab, she is involved in a study of the effects that gut fungal species have on immune function in a murine model of asthma. Her main role in this project is to functionally characterize the microbe‐host interactions by proteomic and metabolomic approaches.

Mackenzie Gutierrez

Website: LinkedIn


Mackenzie is a fourth year undergraduate student majoring in Microbiology and Immunology at the University of British Columbia in Vancouver. As part of her co-op studies she has moved back to her home town of Calgary, and joined the Arrieta lab for 2 terms. Mackenzie has been involved in numerous projects in the lab, and is very interested in how the microbiome impacts immunological development, its contributions to the development of chronic diseases and how novel therapeutics can be used to manage such diseases. She has also been awarded the Alberta Innovates Summer Studentship award to fund her focus project exploring the impact of different microbiome populations on modulating the pathology of acute inflammation in the gastro intestinal tract.