Hong Kong-Singapore travel bubble: will Sinovac’s efficacy against Delta coronavirus variant be the next stumbling block?

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A debate over the efficacy of the Sinovac vaccine is emerging between Hong Kong and Singapore, adding another layer of uncertainty to the long-awaited travel bubble between the two cities.

Professor Wallace Lau Chak-sing, convenor of Hong Kong’s advisory panel on coronavirus vaccines, on Thursday defended the efficacy of the mainland China-produced jabs, a day after the city state took issue with the lack of data about their efficacy against the Delta variant.