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Sep.10 — Soumya Swaminathan, chief scientist at the World Health Organization, says AstraZeneca Plc’s halt of its vaccine trial after a patient became ill is a good wake-up call for everyone to recognize that there are ups and down in research and clinical development. She also says there’s currently no way of predicting which vaccine candidates are going to be effective, but that the data from Phase 1 and 2 studies has been quite promising for most. She spoke Thursday at a briefing in Geneva. (Excerpts)

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