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The two countries accounted for over a third of all new cases in the past week. Brazil reported a record 54,700 new cases on June 19. Some researchers said the death toll in Latin America could rise to over 380,000 by October, from around 100,000 this week.
The total number of cases continued to increase at a rate of between 1-2% a day in the past week, down from rates above 10% in March.
Countries including China, New Zealand and Australia have seen new outbreaks in the past month, despite largely quashing local transmission.
In Beijing, where hundreds of new cases were linked to an agricultural market, testing capacity has been ramped up to 300,000 a day.
The United States, which has reported the most cases of any country at more than 2.5 million, managed to slow the spread of the virus in May, only to see it expand in recent weeks to rural areas and other places that were previously unaffected.
In some countries with limited testing capabilities, case numbers reflect a small proportion of total infections. Roughly half of reported infections are known to have recovered.
