The vast majority of Singapore residents are vaccinated and worldwide, nearly 6 billion shots have been given. Yet, barely nine months later, the first call for booster shots has gone out. But what does the data say? Why are there mixed scientific views? Will this confusion create even more uncertainty and affect eventual uptake? Lin Suling gets Dr Leong Hoe Nam, infectious disease specialist at Mount Elizabeth Novena Hospital and Dr Hsu Li Yang of NUS Saw Swee Hock School of Public Health to break it down.

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