evidence: To date, more than 339 million doses of Covid-19 vaccine have been administered to give people protection from the coronavirus; several studies show that the three vaccines authorized for emergency use in the United States work and are safe; and the government continues to give them out in schools and at ball fields, and yet, not one has been formally approved by the US Food and Drug Administration. [...] On Wednesday, President Joe Biden told CNN’s Don Lemon during a CNN Townhall that he expects Covid-19 vaccines could get full approval "quickly." [...] The Covid-19 vaccines received authorization based on interim data that showed the vaccines were safe and effective for only about three months. "Although, when something’s 95% effective, you can assume it’s probably going to be highly effective for awhile," said Offit.