Letter to the Editor
Retrospective search of SARS-CoV-2 in respiratory samples in Vallès Occidental (Barcelona, Spain) before the first case was reported
Búsqueda retrospectiva del SARS-CoV-2 en muestras respiratorias en el Vallès Occidental (Barcelona, España) antes de que se notificara el primer caso
Ana Blanco-Suárez
, Pepa Pérez-Jové, Nerea Escribano-Castillejo, Mónica Ballestero-Tellez
Corresponding author
Servicio de Microbiología, Catlab, Viladecavalls, Barcelona, Spain
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| 2021 December | 11 | 9 | 20 |
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| 2021 September | 10 | 5 | 15 |
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