Scientists struggle to pinpoint Melbourne’s index Delta case
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.