Coronaviruses are a group of related viruses that cause diseases such as SARS, MERS and COVID-19.
IMAGE: By NIAID - https://www.flickr.com/photos/niaid/49534865371/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=87484997 TEXT: National Center for Competency Testing, "Coronavirus Disease-2019 (COVID-19)"