Trump upbeat on Covid-19 vaccine, says 3 candidates are looking good

US President Donald Trump on Thursday voiced optimism the United States would soon come up with a vaccine for the novel coronavirus, saying three vaccine candidates were looking especially good.

"Three are really, really looking good," Trump said at an event at the White House, without providing details. 

"We think we're going to have it soon."

US National Institutes of Health Director Dr. Francis Collins said earlier on Thursday that he was optimistic the Trump administration's vaccine-acceleration program "Operation Warp Speed" will generate a safe and effective vaccine for Covid-19 by year-end and can meet a target of making 300 million doses by