LISBON (Reuters) - Some Europeans on Tuesday injected a dose of caution into the excitement which greeted news that Pfizer's experimental COVID-19 vaccine was more than 90% effective in initial trials, expressing doubts about whether they would have the shot.
Scientists and public health officials on Monday welcomed the first successful interim data from a large-scale clinical test as a watershed moment that could help turn the tide of the pandemic if the full trial results pan out.
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