https://www.has-sante.fr/jcms/p_3236195/fr/avis-n-2021-0006/ac/seap-du-4-fevrier-2021-du-college-de-la-has-relatif-a-la-prise-en-charge-derogatoire-de-la-detection-antigenique-n-du-virus-sars-cov-2-sur-prelevement-sanguin-en-application-de-l-article-l-165-1-1-du-css 2021 France pneumonia, viral coronavirus infections scientific and technical information Viruses antigens Virus virus, nos Antigens patient care management blood specimen collection Fracture-dislocation viruses viral load blood group antigen covas blood group antigen n Severe acute respiratory syndrome-related coronavirus detective viruses pandemics COVID-19