On the cover: Transmission electron micrograph of SARS-CoV-2 virus particles, isolated from a patient. Image captured and color-enhanced at the National Institute of Allergy and Infectious Diseases (NIAID) Integrated Research Facility (IRF) in Fort Detrick, Maryland. Credit: NIAID/National Institutes of Health / Science Source. Unique identifier: SS22559419. For further information, please visit sciencesource.com.

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