Performance of saliva and mid-turbinate swabs for detection of the beta variant in South Africa. Issue 10 (October 2021) - Chu, Chun Yat; Marais, Gert; Opperman, Christoffel; Doolabh, Deelan; Iranzadeh, Arash; Marais, Carisa; Cox, Helen; Williamson, Carolyn; Hardie, Diana; Brink, Adrian