Australia’s quarantine system, in which many overseas arrivals must stay in designated hotels in major cities for 14 days, must be reinforced or redesigned as more virulent strains of the virus spread worldwide.Infectious particles expelled from an infected person’s nose and mouth are thought to be the main source of Covid-19 infection.
Although larger respiratory droplets from coughs and sneezes are the main source of transmission, a growing body of evidence is implicating smaller aerosol particles that can float in the air further and longer.In light of that, the U.S.