With every new batch of numbers anywhere in the world, the delta variant is proving it is a fearsome opponent. The old COVID-19 model we thought we had beaten is light years in infectivity from this weaponised variant now challenging Australia’s best contact tracers in NSW. This strain is as infectious as measles and is at least as deadly.

Let me give you an example of a recent transmission in Sydney. One infected bloke, fully vaccinated with Pfizer and wearing a mask, utters 14, yes, 14, words to a colleague, also fully vaccinated but drinking tea, so unmasked. Infected bloke moves off.