Harvard Medical School Professor Martin Kulldorff tells Sky News Australia the Delta variant of COVID-19 is “not a gamechanger” or a mutation we should be “specifically concerned about”.

PHOTO CREDIT: Illustration of a SARS-CoV-2 virion By Alissa Eckert, MS; Dan Higgins, MAM – This message is number 23312 in the Public Health Image Library (PHIL) of the CDC., Public Domain, https://commons.wikimedia.org/w/index.php?curid=86444014