A woman wearing mask walks in a shopping mall in Sydney, Australia, on March 2, 2020. Australia's first person-to-person transmissions of COVID-19 were confirmed in the State of New South Wales (NSW) on Monday, with two people contracting the disease while on Australian soil. (Xinhua/Bai Xuefei)

Chief Health Officer of the State of New South Wales (NSW) Dr Kerry Chant attends a press conference in Sydney, Australia, on March 2, 2020. Australia's first person-to-person transmissions of COVID-19 were confirmed in the State of New South Wales (NSW) on Monday, with two people contracting the disease while on Australian soil. (Xinhua/Bai Xuefei)

Photo taken on March 2, 2020 shows the empty shelf for flour in a super market in Sydney, Australia. Australia's first person-to-person transmissions of COVID-19 were confirmed in the State of New South Wales (NSW) on Monday, with two people contracting the disease while on Australian soil. (Xinhua/Bai Xuefei)

Photo taken on March 2, 2020 shows the empty shelf for tissue paper in a super market in Sydney, Australia. Australia's first person-to-person transmissions of COVID-19 were confirmed in the State of New South Wales (NSW) on Monday, with two people contracting the disease while on Australian soil. (Xinhua/Bai Xuefei)

A woman wearing mask walks on street in Sydney, Australia, on March 2, 2020. Australia's first person-to-person transmissions of COVID-19 were confirmed in the State of New South Wales (NSW) on Monday, with two people contracting the disease while on Australian soil. (Xinhua/Bai Xuefei)