You may have encountered the term "D614G mutation" when reading about the COVID delta variant. What does this mean? Why is it important? Why does it make "delta COVID" more infectious? Keep reading.
We need new coronavirus variants like a duodenal ulcer, but they're here – something any virologist would have said was inevitable. Here's a lesson on how mutation works. Plus an explanation of what those crazy letters and numbers mean that you see in the news.