Imagine the day when we finally overcome the COVID-19 crisis. We’ve rolled out a vaccine to contain the virus, and everyone is able to go outside again and return to their normal lives.But then we find out, just as we’ve been reuniting with all our old friends and returning to work, that there’s another strain of COVID-19 has been lurking around. And it’s one that we aren’t prepared for. Could this lead to a second wave of the pandemic? Would our original vaccine have any effect on it? Could a new strain be even deadlier than the original?