US clears Pfizer COVID-19 vaccine; Trump tweets first shot 'in less than 24 hours'

US regulators have approved the emergency use of the country's first COVID-19 vaccine from Pfizer and its German partner BioNTech for people aged 16 years and older, marking the beginning of the end of a catastrophic outbreak, which has killed nearly 3,00,000 Americans in just 11 months this year.

"The FDA's authorisation for...