The American Medical Association (AMA) on Wednesday criticised the government's guidelines on quarantine and isolation in the United States, saying the guidance was "confusing" and risked further spread of Covid-19.

On Tuesday, the US Centers for Disease Control and Prevention (CDC) stopped short of recommending a rapid antigen test for people seeking to end their Covid-19 isolation at five days.

"A negative test should be required for ending isolation after one tests positive for Covid-19. Re-emerging without knowing one's status unnecessarily risks...