Three new Omicron subvariants have reached Australia and health authorities say people who contract the virus should wait three months before getting their next COVID-19 vaccination.
Associate Professor Stuart Turville from the UNSW's Kirby Institute says Omicron subvariants BA.2.12.1, BA.4 and BA.5 have been detected in Australia.
Authorities are warning this winter season is likely to see a spike in COVID-19 cases and flu as restrictions which have suppressed the circulation of both viruses are phased out.
The latest advice from the Australian Technical Advisory Group on Immunisation recommends people wait three months after a confirmed COVID-19 infection and then receive their next vaccine dose as soon as possible.
The advice, issued last week, applies to all people and for all COVID-19 vaccines.
Prof Turville said the severity and transmissibility of the new Omicron subvariants had yet to be determined.
The arrival of Omicron BA.1 and BA.2 were marked by their ability to significantly evade a previous antibody response through past infection and/or vaccination, but the impact was less severe.
The new subvariants BA.4, BA.5 and BA2.12.1 are likely to displace BA.1 and BA.2 in Australia.
"We will need to study this over time to see if their advantage is one of "fitness/transmissibility" and/or their ability to be more slippery to existing antibodies," Prof Turville said.
"As with all variants, the key parameter to watch is disease severity and this data takes time to accumulate.
"There is still a lot about this virus that is unknown and there are many paths it has the potential to take."
Western Australia meanwhile reached a new peak in daily cases, less than a week after removing the vast majority of its public health restrictions.
The state recorded 9782 infections, exceeding the previous peak of 9754 more than a month earlier.
LATEST 24-HOUR COVID-19 DATA:
NSW: 11,939 cases, 21 deaths, 1510 in hospital, 68 in ICU
Victoria: 10,779 cases, 11 deaths, 473 in hospital, 25 in ICU
Queensland: 7668 cases, eight deaths, 504 in hospital, 21 in ICU
Tasmania: 1078 cases, one death, 50 in hospital, two in ICU
Northern Territory: 399 cases, 37 in hospital, one in ICU
South Australia: 3591 cases, 12 deaths, 221 in hospital, 11 in ICU
Western Australia: 9782 cases, two historical deaths, 242 in hospital, 10 in ICU.