As the world surged past the 5 million-mark in confirmed coronavirus cases Thursday, the director of the U.S. Centers for Disease Control and Prevention said he can't predict whether another round of lockdowns is coming as a possible second wave of the virus looms.

Meanwhile, the U.S. pledged to spend up to $1.2 billion for an experimental COVID-19 vaccine being tested in England, and researchers said tens of thousands of American lives could have been saved if social distancing measures had been enacted only a week earlier. 

On his visit to Ford in Michigan on Thursday, President Donald Trump did not wear a mask in front of photographers because he "didn’t want to give the press the pleasure of seeing it" although Ford officials encouraged him to wear one.

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