12879_2020_5281_MOESM1_ESM.mp4 (14.72 MB)
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Additional file 1 of Scent dog identification of samples from COVID-19 patients – a pilot study

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posted on 24.07.2020, 04:02 by Paula Jendrny, Claudia Schulz, Friederike Twele, Sebastian Meller, Maren von Köckritz-Blickwede, Albertus Dominicus Marcellinus Erasmus Osterhaus, Janek Ebbers, Veronika Pilchová, Isabell Pink, Tobias Welte, Michael Peter Manns, Anahita Fathi, Christiane Ernst, Marylyn Martina Addo, Esther Schalke, Holger Andreas Volk
Additional file 1: Additional video. Detection dog working with DDTS. The video (Additional file 1) shows the Labrador Retriever “Seven” during a detection session. The Detection Dog Training System (DDTS) can be seen at the bottom of the video. The scent hole with a sample of an SARS-CoV-2 infected individual is marked in green on the video (please note the green mark was not seen by the dog and was only used in the video as a visualisation tool for the viewer to demonstrate the dog’s search and detection behaviour). At each detection trial run only one hole is presenting the target scent with the other six holes presenting saliva samples from SARS-CoV-2 negative tested individuals. When the dog detects the target scent, the nose will be left within the hole for ≥2 s to indicate the detection. This will be recorded by the device. A beeping sound announces the food or ball reward, which is automatically ejected by the device, distracting the dog for a short time period. In the meantime, the device rearranges the sample presentation in an automatic and random fashion, presenting one other scent hole with a sample of a SARS-CoV-2 positive tested individual and six control scent holes with negative control samples. In the upper left corner of the video, one can see how the figures change depending on the detection behaviour of the dog (true positive [correct indication; n = 3], true negative [correct rejection; n = 8], false positive [incorrect indication; n = 0], and false negative [incorrect rejection; n = 1]).