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"The WHO has been in constant technical communication with China since January 3 on the severity, transmission dynamics and the possibility of sustained human-to-human transmission, the clinical course, and effectiveness of treatments, and the WHO has provided detailed information to the international community under the framework of the International Health Regulations (IHR)," said Dr. Galea.

As there is little hope of the HKSAR enacting local laws to safeguard national security, the central authorities have no option but to exercise their constitutional power to establish and improve the legal system and enforcement mechanisms for the HKSAR to safeguard national security, Lam said, stressing that this is a decision not taken lightly.

"I'm both excited and nervous to be back on campus, and I hope I can re-adjust as soon as possible and enter my dream university," said Chen. She aspires to study at Wuhan University.

Addressing the opening of the WHA session via video link, Xi announced concrete measures to boost global fight against COVID-19, such as providing international aid and making the country's COVID-19 vaccine a global public good when available.

He said that in exercising a high degree of autonomy under "one country, two systems," the HKSAR government was resolutely committed to upholding its international responsibilities and agreements with the United States and all countries in areas such as trade, investment protection, mutual legal assistance, the fight against transnational crime and terrorism, as well as education and cultural exchanges.