As COVID-19 continues to create havoc in everyday lives, the need to limit the spread of the virus remains a challenge, even with advances in medical knowledge and patient care, and the promise of a vaccine. Furthermore, COVID-19 is one in a recent series of airborne diseases, and probably not the last one, given the ongoing encroachment of humans into animal habitat. This paper proposes that a key challenge related to virus containment is physical containment. That is, maintaining safe distance from individuals who might have been exposed to the virus. A physical distancing app is proposed, and the challenges associated with its development and use identified.