New coronavirus cases had their biggest daily increase ever as the pandemic worsens globally and has yet to peak in central America, the World Health Organization (WHO) said on Monday, urging countries to press on with efforts to contains the virus.

“More than six months into the pandemic, this is not the time for any country to take its foot off the pedal,” WHO Director General Tedros Adhanom Ghebreyesus told an online briefing.

More than 136,000 new cases were reported worldwide on Sunday, the most in a single day so far, he said. Nearly 75% of them were reported from 10 countries, mostly in the Americas and South Asia.

In response to a question on China, WHO’s top emergencies expert, Dr. Mike Ryan, said retrospective studies of how the outbreak has been addressed could wait, adding: “We need to focus now on what we are doing today to prevent second peaks.”

Ryan also said infections in central American countries including Guatemala were still on the rise, and that they were “complex” epidemics.

“I think this is a time of great concern,” he said, calling for strong government leadership and international support for the region.

Brazil is now one of the hotspots of the pandemic, with the second highest number of confirmed cases, behind only the United States, and a death toll that last week surpassed Italy’s.

After removing cumulative numbers for coronavirus deaths in Brazil from a national website, the Health Ministry sowed further confusion and controversy by releasing two contradictory sets of figures for the latest tally of infection cases and fatalities.