Here is an interesting piece on WHO involvement from Sydney Morning Herald
February 1 would prove to be a fateful day: it was when Australia truly decided to move ahead of the WHO and never look back.
Other measures that would follow - such as the worldwide travel ban, declaring a global pandemic, the creation of the national cabinet and social-distancing measures - all stemmed from this day.
Announcing the ban, Morrison was questioned by a journalist over why Australia was doing it against the advice of the WHO. “Because our medical advice is it’s in the interest of Australians to do so,” Morrison said.
Two days later, the WHO’s director-general, Tedros Adhanom Ghebreyesus, hit out at Australia and the United States for putting in place travel restrictions from China, saying there was no need for measures that “unnecessarily interfere with international travel and trade”. If anything, this reinforced the Australian government’s decision.