Also Read | The march of 2020 in 10 key long readsWorry has been growing since before Christmas, when Britain's prime minister said the coronavirus variant seemed to spread more easily than earlier ones and was moving rapidly through England.
On Tuesday, Colorado health officials said they had found it there.Here are some questions and answers on what's known about the virus so far.Q: WHERE DID THIS NEW VARIANT COME FROM?A: New variants have been seen almost since the virus was first detected in China nearly a year ago.
Viruses often mutate, or develop small changes, as they reproduce and move through a population.Most changes are trivial. "It's the change of one or two letters in the genetic alphabet that doesn't make much difference in.