The head of the Australian Medical Association (AMA) in South Australia says the organisation is "already concerned" about the BA.2.75 subvariant of COVID-19 "on the horizon", but the federal health department says there has only been 150 recorded cases in the country so far.
The chief scientist with the World Health Organization (WHO) says the Omicron subvariant appeared to have mutated in a way that could indicate "major immune escape".
