Will doggy detectors sniff out Covid-19?

One of the many approaches to curbing the number of cases of Covid-19 is to find those who are asymptomatic or pre-symptomatic. In an attempt to do that, the UK government is funding a clinical trial to see if dogs can sniff out the virus. Trained dogs are already used to detect illegal drugs, explosive and prostate cancer. This article explains why this approach might work and how the dogs will be trained.