duration of protection against severe disease and asymptomatic infection as well as the duration of immunity following infection or vaccination.
（Brooks Smith and Michael Chagares.FILE PHOTO: Mexicos President Andres Manuel Lopez Obrador listens to the national anthem as he arrives to address the nation on his second anniversary as president of Mexico.
還said he was deeply worried that Hong Kongers freedom to access information on the internet was starting to be affected.
國navigates the economic recovery from the COVID-19 pandemic.
個The government said in 2018 that would happen.
Reporting by Tuvan Gumrukcu and Ali Kucukgocmen; Editing by Dominic Evans.