The United States has reported more than a million coronavirus infections only because of its testing, President Donald Trump said on Wednesday, hailing the effort as being "much better than any other country in the world".
The Twitter comments came amid warnings from state public health officials that shortages of trained workers and materials have limited testing capacity.
"The only reason the US has reported one million cases of coronavirus is that our testing is sooo much better than any other country in the world," Trump said on Twitter.
"Other countries are way behind us in testing, and therefore show far fewer cases."
A Reuters tally
shows the United States has by far the world's largest number of confirmed cases at more than a million, with total deaths topping 58,000 by late Tuesday.
Cases exceeded 3.1 million worldwide, with more than 216,000 deaths, Reuters calculations show
The rise pressures efforts to boost testing capacity and health officials flagged the challenge of getting tests to those who need them most.
"One of the problems has been is the tests getting to the people who need them," US infectious diseases expert and health official Anthony Fauci told CNN in an interview on Tuesday.
Fauci, head of the National Institute of Allergy and Infectious Diseases, said every American in need of a virus test should be able to get one by the end of May or the beginning of June.
"Everyone who needs a test, according to the way we're approaching the identification, isolation, contact tracing - keeping the country safe and healthy, hopefully, we should see that as we get toward the end of May, the beginning of June," Fauci said.
The virus has taken an unprecedented toll of the US economy, with a likely contraction in the first quarter at its sharpest pace since the Great Recession, as stringent measures to slow the virus spread almost shut down the nation, ending the longest expansion in its history.
The number of Americans seeking jobless benefits over the past five weeks has soared to 26.5 million, or nearly one in six US workers, and the Trump administration has forecast an April unemployment rate exceeding 16%.