‘Immensely reassuring’: 600,000-people test gives thumbs up to Pfizer vaccine – Sydney Morning Herald

The study was led by researchers from the Clalit Research Institute and Ben-Gurion University of the Negev in Israel, with Harvard University in the US. It did not report on safety of the vaccine, just effectiveness, but no unexpected problems arose in previous testing.
Researchers compared nearly 600,000 people 16 and older in Israels largest healthcare organisation who were given shots in December or January to an equal number of people of similar age, sex and health who did not receive a vaccine….

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