From March 2020 onwards, when COVID-19 spread throughout Europe, GPs had to rely on clinical information collected in hospitals, the only official information available, when dealing with potential infections. “However, we also heard, from colleagues or even through social media, of other and unconfirmed information that reported very different clinical pictures encountered by GPs,” explains Dr. Hubert Maisonneuve, a lecturer and researcher in the research group led by Professor Dagmar Haller at the Primary Care Unit of the UNIGE Faculty of Medicine, and a GP in the Lyon region. “Since it was extremely difficult to test our patients, we decided, with a few colleagues and in collaboration with two ambulatory laboratories, to set up studies that would allow us to better understand the symptomatology of COVID-19 in its mild forms, and potentially develop a clinical evaluation tool.” To this end, clinical data from more than 1,500 patients who underwent a PCR test were collected between March 24 and May 7, 16% of whom tested positive for COVID-19.