SYDNEY (Reuters) – Australia’s political leaders were set to hold an emergency meeting on Wednesday as cases of the Omicron coronavirus variant broke infection records and forced countries around to world to double down on vaccinations, just days before Christmas. Authorities globally have imposed new restrictions and stepped up inoculation efforts as Omicron emerges as the dominant strain of the virus, upending imminent reopening plans that many governments hoped would herald the start of a post-pandemic era in 2022. Singapore will freeze all new ticket sales for flights and buses under its p…

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