A coronavirus breathalyzer is a diagnostic medical device enabling the user to test with 90% or greater accuracy the presence of severe acute respiratory syndrome coronavirus 2 in an exhaled breath. As of the first half of 2020, the idea of a practical coronavirus breathalyzer was concomitantly developed by unrelated research groups in the Singapore, Brazil, United States, The Netherlands, Finland, Germany, Israel, England, Australia, Indonesia, Canada, Poland and United Kingdom.