There are different strains of coronavirus. So what does that mean for a vaccine?

Updated Apr 15, 12:28 PM; Posted Apr 15, 7:00 AM   While doctors say there are different strains of novel coronavirus, for the most part, they aren’t that different. (CDC) By Mary Kilpatrick,   CLEVELAND, Ohio — While doctors have found different strains of the novel coronavirus, until now doctors have believed they aren’t that different. […]