The Australian city of Brisbane has begun a snap three-day lockdown after a cleaner in its hotel quarantine system became infected with coronavirus. Health officials said the cleaner had the highly transmissible UK variant and they were afraid it could spread. Brisbane has seen very few cases of the virus beyond quarantined travellers since Australia's first wave last year. It is the first known instance of this variant entering the Australian community outside of hotel quarantine. The lockdown is for five populous council areas in Queensland's state capital. Premier Annastacia Palaszczuk announced the measure on Friday morning local time, about 16 hours after the woman tested positive. Ms Palaszczuk said the lockdown aimed to halt the virus as rapidly as possible, adding: "Doing three days now could avoid doing 30 days in the future." "I think everybody in Queensland... knows what we are seeing in the UK and other places around the world is high rates of infection from this particular strain," she said. "And we do not want to see that happening here in our great state." Australia has reported 28,500 coronavirus infections and 909 deaths since the pandemic began. By contrast, the US, which is the hardest-hit country, has recorded more than 21 million infections while nearly 362,000 people have died of the disease.