The same coronavirus strain turned up in an Australian and a tiger. How?

From Wuhan to Australia and then on to infect a tiger in New York, how is the virus changing as it travels the world?

source https://www.smh.com.au/national/the-same-coronavirus-strain-turned-up-in-an-australian-and-a-tiger-how-20200622-p554wq.html?ref=rss&utm_medium=rss&utm_source=rss_feed