'R' Rising In At Least 4 Countries, Australia Locks Down To Battle Delta Spread

One of the countries where the R factor is as high as India is Australia. The army is patrolling the streets of Sydney which is in its sixth week of lockdown. Brisbane has extended its lockdown. Only 19% of Australian adults have been fully vaccinated. What are countries like Australia doing to contain the spread? Professor Nikolai Petrovsky, College Of Medicine And Public Health, Flinders University, joins us from Adelaide.