Hong Kong residents with an Identity card accompanied by a visa marked with “Permission to remain extended until” may enter Hong Kong within the validity of the permitted stay.
Airline crew, government officials, spouses and minor children of Hong Kong residents, and personnel endorsed by the HKSAR government to engage in anti-epidemic work may also enter.
Children under the age of 2 are exempt from presenting a COVID-19 test.
Travelers with proof of recovery from the virus within the last 90 days prior to boarding. Proof of a recent positive viral test and a letter from your healthcare provider or a public health official stating that you were cleared to travel.
More info at the CDC site
Travelers who did not get tested, are advised to stay home and self-quarantine for 10 days after travel.
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