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

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.

Professor Sharon Lewin
Professor Sharon Lewin.

Melbourne’s outbreak continues to grow amid new warnings the Delta ‘variant of concern’ — now the dominant strain in the