The highly contagious Delta variant of the coronavirus is the "greatest threat" to America’s attempt to eradicate the Covid-19 pandemic, White House Chief Medical Advisor Dr Anthony Fauci has warned.
Speaking at a White House briefing on Covid-19 on Tuesday, Fauci said the variant, which was first identified in India, now makes up more than 20 per cent of all new cases in the US. It's a significant increase from nearly 10 per cent two weeks ago.
However, the “good news” is that the US vaccines are effective against the Delta variant, said Fauci.
he World Health Organization classified the Delta variant as a variant of concern on May 10.