Hong Kong expanded a ban on entry for non-residents from several countries as global health authorities raced to curb a potential outbreak of the Omicron virus, while Australia's cabinet will review on Tuesday containment steps after five tested positive.
Singapore's health ministry said two travellers from Johannesburg who tested positive for the variant in Sydney had transited through its Changi airport.
Omicron - first reported in southern Africa and which the World Health Organization (WHO) said carries a "very high" risk of infection surges - has triggered global alarm, with border closures casting a shadow over a nascent economic recovery from a two-year pandemic.
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