news Singapore travel bubble or local housing, Hongkongers don’t come first in Hong Kong Containers carrying Sinovac Covid-19 vaccines are unloaded from a Cathay Pacific plane at Hong Kong International Airport on February 19. To qualify for travel bubble flights between Hong Kong and Singapore, travellers from Hong Kong must be vaccinated – but not travellers from Singapore. Photo: SCMP Pictures It has been four weeks since I had my second Covid BioNTech vaccination and by now the antibodies should be building up in my body. As a good citizen I also use the Leave Home Safe and the iAM Smart government apps.