"STOCK MARKET UP BIG, VACCINE COMING SOON," the US President tweeted.
US President Donald Trump on Monday said it is "great news" that a vaccine jointly developed by Pfizer and BioNTech was 90 percent effective in preventing Covid-19 infections.
"STOCK MARKET UP BIG, VACCINE COMING SOON. REPORT 90% EFFECTIVE. SUCH GREAT NEWS!" the President tweeted minutes after Pfizer announced the development and days after he lost the US presidential election to Democrat Joe Biden.
His defeat was blamed, in part, on his administration's response to the coronavirus pandemic, with infections surging across the US in recent days.
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