According HK Government web info in section “inbound-travel”

The Government announced that the quarantine requirements for persons arriving at Hong Kong who have received COVID-19 vaccination will be adjusted in phases.

First phase: serology antibody tests at own cost before departure

The first phase of the arrangements was implemented on 30 June 2021.

• Persons arriving at Hong Kong who have only stayed in Group B specified places or Taiwan on the day of arrival or the 14 days before that day will be subject to a shortened compulsory quarantine period of seven days at designated quarantine hotels if they fulfill the following three conditions.

… … details of the arrangement, please refer to Gov website … …

Info source : https://www.coronavirus.gov.hk/eng/inbound-travel.html

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