Hong Kong:
Centre of Health Protection, HKSAR
COVID-19 Thematic Website - Together, We Fight the Virus!, HKSAR
COVID-19 Vaccination Programme, HKSAR
China:
中國疾病預防控制中心 - http://www.chinacdc.cn/
中華人民共和國國家衛生健康委員會 - http://www.nhc.gov.cn/
International:
The World Health Organization - https://www.who.int/emergencies/diseases/novel-coronavirus-2019
Centers for Disease Control and Prevention (U.S.) - https://www.cdc.gov/coronavirus/index.html
NHS (UK) - https://www.nhs.uk/conditions/coronavirus-covid-19/