Media type: E-Article Title: Smallpox and other viruses plagued humans much earlier than suspected Contributor: Spinney, Laura imprint: Springer Science and Business Media LLC, 2020 Published in: Nature Language: English DOI: 10.1038/d41586-020-02083-0 ISSN: 1476-4687; 0028-0836 Keywords: Multidisciplinary Origination: Footnote: