The researchers said in the medical journal The Lancet that the vaccine produced antibodies and killer T-cells to combat the infection that lasted at least two months.
While normal hospital operations look set to resume, patients remain concerned about seeking care but analysts are optimistic for a recovery in elective procedures post-coronavirus.
The European Central Bank and its president, Christine Lagarde, face another crucial test this week as they hold off on any new monetary stimulus, but try not to destroy a belief that more firepower is available.
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