A healthcare worker prepares a COVID-19 test outside Brooklyn Hospital Center during the coronavirus pandemic in the Brooklyn borough of New York, the United States, on April 14, 2020. The number of COVID-19 cases in the United States topped 600,000 Tuesday evening, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. The country has seen 602,989 cases with 25,575 deaths by 6:50 p.m. (2250 GMT), according to the CSSE. (Photos: Xinhua)

People wearing face masks wait in line to do shopping at a Whole Foods store during the coronavirus pandemic in the Brooklyn borough of New York, the United States, on April 14, 2020. The number of COVID-19 cases in the United States topped 600,000 Tuesday evening, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. The country has seen 602,989 cases with 25,575 deaths by 6:50 p.m. (2250 GMT), according to the CSSE.

A social distancing sign is seen in McCarren Park during the coronavirus pandemic in the Brooklyn borough of New York, the United States, on April 14, 2020. The number of COVID-19 cases in the United States topped 600,000 Tuesday evening, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. The country has seen 602,989 cases with 25,575 deaths by 6:50 p.m. (2250 GMT), according to the CSSE.

People wearing face masks wait in line to do shopping at a store during the coronavirus pandemic in the Brooklyn borough of New York, the United States, on April 14, 2020. The number of COVID-19 cases in the United States topped 600,000 Tuesday evening, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. The country has seen 602,989 cases with 25,575 deaths by 6:50 p.m. (2250 GMT), according to the CSSE.

People wearing face masks wait in line outside a Whole Foods store during the coronavirus pandemic in the Brooklyn borough of New York, the United States, on April 14, 2020. The number of COVID-19 cases in the United States topped 600,000 Tuesday evening, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. The country has seen 602,989 cases with 25,575 deaths by 6:50 p.m. (2250 GMT), according to the CSSE. (Photo by Michael Nagle/Xinhua)

A sign expressing NY's love of doctors and nurses is displayed in a pizza store across from Brooklyn Hospital Center during the coronavirus pandemic in the Brooklyn borough of New York, the United States, on April 14, 2020. The number of COVID-19 cases in the United States topped 600,000 Tuesday evening, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. The country has seen 602,989 cases with 25,575 deaths by 6:50 p.m. (2250 GMT), according to the CSSE.