is:other lang:en COVID-19 United Kingdom variant of concern investigation Delta variant Delta variant logistic growth rate context dependent biological transmissibility secondary attack rate South Africa Botswana Hong Kong immune escape susceptibility to treatment

is:tweet lang:en COVID-19 variant TAG-VE B.1.1.529 variant B.1.1.529 botswana south africa researcher dicrimination country WHO

is:twitter lang:en omicron South Africa Botswana world aviation network likely destination United States

is:twitter lang:en COVID-19 Botswana Hong Kong discovery Omicron

is:tweet lang:en COVID-19 B.1.1.529 sequence Africa South Africa Botswana mutation CoVariant focal build mutational profile Nextstrain clade 21K

is:tweet lang:en COVID-19 Omicron India Denmark Singapore data UK Sweden plot visualization South Africa Sri Lanka Botswana trajectory

is:webpage lang:en COVID-19 vaccine variant mutation Omicron spike protein protein transmission VOC Botswana concern

is:news lang:en COVID-19 South Africa Omicron variant travel restrictions travel ban Botswana scientific transparency VOC science WHO testing mass vaccination vaccine campaign booster mutation modeling immunity government economy tourism UK

is:tweet lang:en visualization Omicron variant South Africa Botswana USA travel ban

is:news lang:en COVID-19 Omicron variant vaccine WHO evidence vaccine efficacy risk transmissibility mutation Botswana severity government UK NHS UN vaccine inequity vaccination rate EU South Africa travel measures transmission mortality

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