A DCN review of scientific literature and anecdotal advice from scholars of taste and smell shows dozens of examples of coffee being used as the barometer for a kind of sniff-test for COVID-19, in part for its distinct smell and also for its availability in homes throughout the world.The CDC now lists the loss of smell, known as anosmia, as one of the most common symptoms of COVID-19, with most recent studies indicating that about 50% to as much as 80% of people testing positive for the virus have suffered from anosmia.