"We are now seeing a very large acceleration in cases in the U.S. So it does have that potential," WHO spokeswoman Margaret Harris told reporters on Tuesday.
Taylor, who won gold at the London 2012 Games and Rio 2016 Games, is one of many athletes unable to train due to government protocols on social distancing and facilities being closed.
"I'm not jumping at all. There is no sandpit for me, I have not put on jump spikes for two weeks," said Taylor.