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Two Arab nations have become the first countries to approve a Chinese COVID-19 vaccine, a significant boost for China’s plans to roll out its vaccines worldwide. The United Arab Emirates (UAE) approved a vaccine developed by Chinese state-owned Sinopharm on 9 December, and Bahrain followed days later. But researchers say a lack of public data on the safety and efficacy of the vaccine could hinder the company’s plans to distribute the vaccine in a range of other countries.