Australia is heading for its third Omicron wave. Here's what to expect from BA.4 and BA.5

Australia is heading for its third Omicron wave in the coming weeks, as BA.4 and BA.5 become the dominant COVID strains. BA.4 and BA.5 are more infectious than previous COVID variants and subvariants, and are better able to evade immunity from vaccines and previous infections. So we’re likely to see a rise in case numbers. So what are BA.4 and BA.5? And what can we expect in this next phase of the pandemic?