The epicenter of the covid-19 pandemic has moved from China, where it began late last year, to Europe and the United States. The World Health Organization declared covid-19 a pandemic on March 11 as the coronavirus that causes it infiltrated countries all over the world.

The disease, which can trigger severe respiratory symptoms, has been reported on every continent except Antarctica and in more than 170 countries. Some countries are confirming thousand of new cases each day, including the United States, where testing was slow to begin.

[Tracking the U.S. coronavirus outbreak, state by state]

The U.S. total of confirmed cases has exceeded China’s and is now the highest in the world. Covid-19 has been reported in every state and in many U.S. territories. As more tests are performed, many states are seeing rapid growth in the number of known cases.