The World Health Organization on Sunday, June 21 reported the largest single-day increase in coronavirus cases by its count, at more than 183,000 new cases in the latest 24 hours, the Associated Press reports.

The UN health agency said Brazil led the way with 54,771 cases tallied and the U.S. next at 36,617. Over 15,400 came in in India.

Experts said rising case counts can reflect multiple factors including more widespread testing as well as broader infection.

Overall in the pandemic, WHO reported 8,708,008 cases — 183,020 in the last 24 hours — with 461,715 deaths worldwide, with a daily increase of 4,743.

More than two-thirds of those new deaths were reported in the Americas.

The U.S. has the world’s highest number of reported infections, over 2.2 million, and the highest death toll, at about 120,000, according to Johns Hopkins. Health officials say robust testing is vital for tracking outbreaks and keeping the virus in check.

Brazil’s Health Ministry said the total number of cases had risen by more than 50,000 in a day. President Jair Bolsonaro has been downplaying the risks even as his country has seen nearly 50,000 fatalities, the second-highest death toll in the world.