The Delta variant of the novel coronavirus that was first found in India is the greatest threat to the United States' effort to eradicate Covid-19 in its borders, said US infectious disease expert Dr Anthony Fauci during a Tuesday press call.<br /><br />"The transmissibility is unquestionably greater" in the Delta variant than the original variant of Covid-19, Fauci said, adding that "it is associated with an increased disease severity."<br /><br />The Delta variant is becoming the globally dominant version of the disease, the World Health Organization's chief scientist said on Friday.<br /><br />Fauci said that the vaccines authorized in the United States, including the Pfizer/BioNTech vaccine, are effective against the new variant.
