Rapid testing for Omicron: is a nose swab enough?

The fast-spreading Omicron variant has made us more reliant on rapid at-home antigen tests to tell us if we have COVID-19. But should we be swabbing our throats as well as our noses? For now, the guidance depends on where you live. Some scientists have said people can transmit Omicron when it has infected their throat and saliva but before the virus has reached their noses, so swabbing the nostrils early in the infection will not pick it up.