Hong Kong could find it difficult to secure extra doses of Covid-19 vaccines for a booster shot for residents because of its existing surplus of jabs and slow procurement procedures, experts have warned.Medical advisers earlier this month recommended the government give a booster shot to the elderly and immunocompromised residents at some stage but without giving a specific timetable, although countries such as Singapore and Israel have already started to administer a third jab to citizens.Some…

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