Diagnostic Performance of Dogs for the Olfactory Detection of COVID-19

The design of the study is an open,interventional risk-free, multi-centre diagnostic validation pilot sudy The main objective is the experimental assessment of the intrinsic diagnostic performance (sensitivity, specificity) among the first dog team in Nouvelle Aquitaine French region for the canine olfactory detection of COVID-19 on sweat samples from persons tested by PCR SARS-CoV-2. The secondary objectives are : * the experimental assessment of the intrinsic diagnostic performance (sensitivity, specificity) according to different factors: symptomatic or not, comorbidity, gender, hormonal cycle of women, medication taking, anti-COVID-19 vaccination, canine characteristics and canine detection procedures. * Proof of concept of canine olfactory detection performance with a used face mask. * Determine the biochemical composition of the volatile organic compound(s) (VOCs) associated with COVID-19 and detected by the dogs team. * the assessment of intrinsic and discriminating diagnostic performance (positive and negative predictive values) of dogs for the olfactory detection of COVID-19 on used sweat and/or face mask based on the symptomatology. This study will be conducted in two phases: \- Phase 1: experimental assessment of the intrinsic diagnostic performance (sensitivity, specificity) among the first dogs team in Nouvelle Aquitaine French region for the canine olfactory detection of COVID-19 on sweat samples and face mask from persons tested by PCR SARS-CoV-2. The experimental assessment of the phase 1 wil include two experimental subpopulation samples of people tested by PCR SARS-CoV-2: positive, symptomatic or non-symptomatic (Case subpopulation); and negative non-case-contact, symptomatic or non-symptomatic (Control subpopulation). \- Phase 2: Near-routine live assessment of intrinsic and discriminating diagnostic performance (positive and negative predictive values) of dogs for the olfactory detection of COVID-19 on sweat collection and/or used face mask of persons rountinely screened by PCR SARS-CoV-2. These persons will be recruited consecutively without discrimination of subpopulations.