Tracking SARS-CoV-2 lineage B.1.1.7 dissemination: insights from nationwide spike gene target failure (SGTF) and spike gene late detection (SGTL) data, Portugal, week 49 2020 to week 3 2021 Borges, Vítor and Sousa, Carlos and Menezes, Luís and Gonçalves, António Maia and Picão, Miguel and Almeida, José Pedro and Vieita, Margarida and Santos, Rafael and Silva, Ana Rita and Costa, Mariana and Carneiro, Luís and Casaca, Pedro and Pinto-Leite, Pedro and Peralta-Santos, André and Isidro, Joana and Duarte, Sílvia and Vieira, Luís and Guiomar, Raquel and Silva, Susana and Nunes, Baltazar and Gomes, João P, Eurosurveillance, 26, 2100131 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.10.2100130