The authors declare there are no competing interests. Megan Malherbe conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft. Robyn Pickering analyzed the data, authored or reviewed drafts of the article, and approved the final draft. Deano Stynder analyzed the data, authored or reviewed drafts of the article, and approved the final draft.
