A Covid-19 vaccine, amazingly, is close. Why am I so worried?

A Covid-19 vaccine, amazingly, is close. Why am I so worried?: It’s a truly impressive a feat and a testament to the power of basic and applied medical sciences. Under normal circumstances, vaccine approvals are measured in decades. Milestones that once took months or years have been achieved in days or weeks. If these efforts are successful, the Covid-19 vaccine could take a place alongside the Apollo missions as one of history’s greatest scientific achievements.