by Claire DOYEN JOHANNESBURG, South Africa (AFP) — Access to the laboratory is strictly limited, for the risk of accidental infection is just too high. Here, technicians at whirring machines analyze 18,000 PCR tests a day, looking for signatures of coronavirus. Their work is so precise that just a handful of samples helped the team to discover Omicron — the new virus variant that has triggered global fears of yet another surge in the […]