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To this aim, we aggregated viral and molecular data from 125 contemporary IAV (H1, H2, H3, H5, H7, and H9 subtypes) evaluated in ferrets under a consistent protocol. Three overarching predictive classification outcomes (lethality, morbidity, transmissibility) were constructed using machine learning (ML) techniques, employing datasets emphasizing virological and clinical parameters from inoculated ferrets, limited to viral sequence-based information, or combining both data types. Among 11 different ML algorithms tested and assessed, gradient boosting machines and random forest algorithms yielded the highest performance, with models for lethality and transmission consistently better performing than models predicting morbidity. Comparisons of feature selection among models was performed, and highest performing models were validated with results from external risk assessment studies. Our findings show that ML algorithms can be used to summarize complex in vivo experimental work into succinct summaries that inform and enhance risk assessment criteria for pandemic preparedness that take in vivo data into account.<\/jats:p>","DOI":"10.1038\/s42003-024-06629-0","type":"journal-article","created":{"date-parts":[[2024,8,1]],"date-time":"2024-08-01T18:02:53Z","timestamp":1722535373000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Machine learning approaches for influenza A virus risk assessment identifies predictive correlates using ferret model in vivo data"],"prefix":"10.1038","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3711-0727","authenticated-orcid":false,"given":"Troy J.","family":"Kieran","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9872-1337","authenticated-orcid":false,"given":"Xiangjie","family":"Sun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4097-6724","authenticated-orcid":false,"given":"Taronna R.","family":"Maines","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0755-7368","authenticated-orcid":false,"given":"Jessica A.","family":"Belser","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,8,1]]},"reference":[{"key":"6629_CR1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-021-03687-w","volume":"12","author":"HR Chiu","year":"2022","unstructured":"Chiu, H. 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