SARS-CoV-2 Genomic Sequencing Revealed N501Y and L452R Mutants of S/A Lineage in Tianjin Municipality, China

Dear Editor, Coronavirus Disease 2019 (COVID-19) outbreak caused by sever acute respiratory syndrome coronavirus 2 (SARS-CoV-2) presents a global pandemic which has resulted in more than 4 million people death in the world.In China,the initial transmission of COVID-19 has already been blocked by strict control strategies and effective treatment for patients.All local COVID-19 outbreaks after April 2020 were related to overseas importing.Up to February 2021,207 imported COVID-19 cases have been reported in Tianjin,China (Tianjin Health Commission,2021).