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. 2022 Nov 12;51(3):248–254. doi: 10.1016/j.ajic.2022.10.014

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Fig 1 — Phylogenetic tree of SARS-CoV-2 detected in samples of nasopharyngeal secretion (n = 59) from health care professionals at the PUC-Campinas hospital from May 2020, to September 2020. Cluster C, both nursing technicians in the COVID ward collected on the same day (June 19); cluster H, cleaning staff in the COVID ward collected on June 22 and 29.