(Bloomberg) -- Leaders in Europe intensified efforts to slow contagion, reviving lockdowns in some areas after piecemeal curbs made little impact on a disease that has infected 4.9 million people regionally. New cases in Germany and Bulgaria hit a record, and Hungary and Ukraine reported their highest daily death tolls.

The first trials to deliberately infect people to accelerate development of vaccines could occur in the U.K. next year, while China defended giving jabs still in clinical trials to thousands of people. Airports in London and Paris are preparing to offer rapid tests to passengers, while Singapore will trial testing at large gatherings as its new daily cases dwindle near zero.

Soaring infections in U.S. battleground states are posing a challenge for President Donald Trump two weeks before the election.

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