Weeks of trials produced positive results at veterinary school and research centre l’École Nationale Vétérinaire in Maisons-Alfort, where researchers say German Shepherds trained to detect coronavirus showed a 95-percent success rate in sniffing out the coronavirus that causes Covid-19..
. . . the dogs had to identify the presence of the virus by smelling sweat samples taken from subjects who were infected with Covid-19.”
Source: The Connexion, May 25, 2020. Link. To reach this high success rate, the dogs required four days of training. The German Shepherds used for the trial were also experienced sniffer dogs.
Also see: Training dogs to sniff COVID-19 in . . . armpits? AAHA NEWStat, June 25, 2020. Link. Tony McReynolds shares information on several research projects using dogs to detect SARS-CoV-2.