new, coronavirus, strain, mutation, britain, vaccine, virus, 2019-ncov, 2020, 2021, analysis, antibodies, blood, blood sample, brazil, bud, china, concept, contagion, contagious, coronavirus 2019, covid-19, covid-19 bacterium, diagnosis, england, epidemic, flu, genetic, great britain, illness, infection, infectious, laboratory, medical, medicine, microbiology, mutant, new strain, pandemic, pcr, pneumonia, sars-cov2, south africa, test, transmission, tube, uk, united kingdom, update, variants