Lateral flow tests may be less effective at detecting Omicron even when people are at their most infectious, a US real-world study has found.
Researchers at the US Covid Sports and Society Workgroup examined lateral flow and PCR tests results from 30 people working in offices where there had been an Omicron outbreak in December.
It took an average of three days longer for people to test positive on a lateral flow test — which give results in as little