Release of infectious virus and cytokines in nasopharyngeal swabs from individuals infected with non-alpha or alpha SARS-CoV-2 variants: an observational retrospective study oleh Blandine Monel, Delphine Planas, Ludivine Grzelak, Nikaïa Smith, Nicolas Robillard, Isabelle Staropoli, Pedro Goncalves, Françoise Porrot, Florence Guivel-Benhassine, Nathalie Demory Guinet, Julien Rodary, Julien Puech, Victor Euzen, Laurent Bélec, Galdric Orvoen, Léa Nunes, Véronique Moulin, Jacques Fourgeaud, Maxime Wack, Sandrine Imbeaud, Pascal Campagne, Darragh Duffy, James P. Di Santo, Timothée Bruel, Hélène Péré, David Veyer, Olivier Schwartz