Scientists struggle to pinpoint Melbourne’s index Delta case

There are now 14 people with the highly infectious strain as the state’s outbreak continues to grow
Professor Sharon Lewin
Professor Sharon Lewin.

The highly infectious SARS-CoV-2 Delta variant cluster in Victoria may never be linked to a known source because of inherent limitations to genomic sequencing, a leading infectious diseases expert says.

Melbourne’s outbreak continues to grow amid new warnings the Delta ‘variant of concern’ — now the dominant strain in the UK and India — is about 40% more infectious than the Alpha (UK/Kent) variant.