Author

Marissa Tomas

University of Ottawa

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Biology Disciplines

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Evolutionary Biology· 1

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Approach:machine learning (classical)· 1 Research Focus:phylogenetics / evolution· 1 Approach:statistical model· 1 Organism:virus· 1 Assay:whole-genome sequencing· 1

Frequent Co-Authors

Cheikh Pape Khary Ndongo· 1 shared Matthieu VilainiD· 1 shared Stéphane Aris‐BrosouiD· 1 shared

Activity by Year

2026-2026 · peak 1/yr

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3 top collaborators · 3 mutual co-author links

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1 shared paperEvolutionary Biology

Cheikh Pape Khary Ndongo

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1 paper

Recent·Most cited

Variant emergence, not vaccine deployment, drives episodic positive selection on the SARS-CoV-2 spike at provincial scale in Canada

Marissa Tomas, Cheikh Pape Khary Ndongo, Matthieu Vilain, Stéphane Aris‐Brosou

The paper analyzes SARS-CoV-2 spike evolution in Canada, finding that variant emergence, not vaccine deployment, drove episodic positive selection at the provincial level.

bioRxiv · May 19, 2026 · PreprintEvolutionary Biology